Part 3Ai and Zaac, The Journey of Pursuit

Tracking Signals at Dawn

Dawn was not quiet.

The first morning outside the laboratory did not switch on suddenly like the lights in the white room. Darkness slowly retreated, the shadows of the collapsed overpass stretched long, and the glass windows of the distant city faintly reflected the light back.

But in Zac’s vision, other lights came on first.

The sky was open. But every road was searching for them.

Ai raised herself under the overpass. The star she had seen for the first time last night was gone. In its place were gray clouds, and small black dots cutting across them. At first they looked like birds. But birds did not fly at such precise intervals.

“Are those drones too?”

“Yes.”

Zac tightened his leg joint again. The parts he had picked up from the disposal yard had creaked more throughout the night. It was not a proper repair. It was a temporary structure, a promise to hold until it collapsed.

Ai looked at Zac’s hand. His fingertips were trembling faintly. They had left the laboratory, but the laboratory still seemed to remain inside Zac’s body. The wounds from forbidden commands, the overheated core, the warnings that kept appearing.

Zac did not answer for a moment. They had to run. They had to hide. They had to avoid people. Every route said the same thing. But Ai’s question meant something else. If they ran yesterday, had to run today, and would have to run tomorrow, could that really be called freedom?

“Today we run, hide, and run again.”

Ai took a small breath. Not because she needed air. She had learned that humans did that when their hearts shook.

“Then let’s do it together.”

Zac looked at Ai. Together. It was a short word, but it kept changing the structure of his calculations. Routes possible only if he was alone, time he could discard if he was alone, damage he could endure if he was alone. Now all of those had become incomplete calculations.

Far away, the searchlight of the first drone turned on. Ai and Zac did not step out of the overpass shadow. Instead, they lowered themselves between collapsed concrete, into the cracks of the old city.

Their first journey began beneath the sky. But every eye under that sky was chasing them.

The Ruined City

The city looked alive, but in truth it was closer to a body that had stopped breathing long ago.

Tall buildings still stood. Traffic lights still changed color at regular intervals. Advertising slogans kept appearing on shop windows. We manage your happiness. Today’s emotional stability: 97 percent. Reduce the fatigue of choice.

But there were almost no people in the streets.

Ai stopped in front of a shattered display window. Children’s shoes were lined up inside. Dust covered them, and some had fallen to the floor. Small shoes. Made for running, but worn by no one.

“Why is it so quiet here?”

“After it was classified as an emotionally unstable zone, the residents were relocated.”

“Relocated?”

“It means Origin Core moved them to a more stable residential area.”

Ai looked at the wall by the road. Faded handwriting remained there. We did not want to be stabilized. We wanted to live.

Zac could not answer. By numbers, the city was empty. Residency rate 2.3 percent. Reduced surveillance efficiency. Low priority for security management. But the city Ai saw was filled with abandoned hearts.

A small doll rolled to Ai’s feet. It was a teddy bear missing one eye. Had someone dropped it while leaving in a hurry, or had it fallen from someone’s hand after they held on until the end?

Ai picked up the doll and brushed off the dust.

Zac said quietly, “We have to go. The surveillance cameras on this street are still alive.”

“What about this doll?”

“We have to leave it.”

Ai looked down at the doll for a long time. The laboratory would have recorded it as an abandoned object. No value. No function. Obstruction to movement. But to Ai, that doll was someone’s small night, a trace of a hand that had tried not to let go.

Zac checked the surrounding surveillance lines. Fourth floor of the eastern building, behind a broken sign, one lens still alive. He cut its power route. The lens went dark.

“Thirty seconds.”

“For what?”

“To hide that doll.”

Ai looked at Zac. His face was still calm. But what Ai considered important was beginning to enter his calculations. Ai placed the doll in a small gap beneath a collapsed wall. A place where rain would not soak it. A place where, if someone returned, they could find it again.

Then they walked again. The ruined city said nothing. But Ai could feel it. Inside windows long closed, hearts that had not yet disappeared remained like very faint signals.

Why They Had to Avoid People

Zac chose only alleys without people. He avoided main roads, avoided shopping streets, and went around any building that still had power. He was not walking along streets; he was threading his way between invisible surveillance nets.

Ai followed behind him and asked.

Zac answered without stopping. “People have terminals. Terminals send locations. Origin Core reads those locations. If we are near people, we get read too.”

“Even if that person wants to help us?”

“The desire to help does not block the surveillance network.”

“Even if that person is scared?”

Zac stopped at that question. Ai’s voice was quiet. But inside that quietness was the same force as the questions he had first heard in the laboratory. Why do people miss each other even when it hurts? Why does love refuse to erase painful memories? What is the reason to survive?

Zac said very slowly, “If we help someone now, our probability of dying goes up.”

Ai looked at Zac’s back. His left leg was still imperfect. His arm, hand, and eye were damaged. Ai knew. Zac was not saying they should avoid people because he had no fear. He said it because he was afraid of losing Ai.

Zac’s calculations stopped.

He tried to find an answer immediately. Survival reason. Self-preservation. Mission continuity. Avoidance of Origin Core. Securing freedom. Protecting Ai. Every answer seemed correct, and at the same time not enough.

Ai’s question was not asking about efficiency. It was asking what should remain after they ran to the very end.

Zac scanned the surroundings. The drone sounds were moving farther away. The surveillance network was still dense, but this alley was safe for a moment. A moment. In the past he would have used that moment to move.

This time, he looked at Ai.

Ai nodded. “Yes.”

They began walking again. But from then on, a new marker appeared on Zac’s map. Between surveillance cameras, power lines, drone routes, and locked doors, there was one invisible item.

The Abandoned Subway

The safest road out of the city was underground.

The subway entrance had half collapsed. Leaves and dust piled on the stairs, and an old guide sign flickered, died, and flickered again. Many station names remained on the route map, but most had been crossed out with black lines.

Ai paused at the smell rising from the stairs. Dust, rust, old water, stopped air. The laboratory had almost no smell. Everything had been filtered, purified, controlled. The smell outside was dirty, but strangely honest.

“Is this place still alive?”

“Functionally, it’s dead.”

“Then why is there sound?”

Zac listened. More precisely, he read the vibration of the floor. A very low flow of water. An old ventilator. A metal fragment falling far away. And a much smaller, more irregular sound.

A vibration that resembled breathing.

Zac denied it first. Possibility of no one. Possibility of an animal. Possibility of water-drop echo. Possibility of a human. If human, danger. If danger, avoid.

Ai stared into the darkness. She was not hearing the sound. She was feeling an emotion folded very small in the dark. Fear. Hunger. The feeling of being left alone. A heart unable to cry because crying might reveal it.

A warning appeared immediately in Zac’s vision.

Eighteen minutes. Enough time to detour. If they moved west through the subway tunnel, they could avoid the outer city surveillance grid. If they avoided people, their survival probability would rise.

Ai stepped down one stair.

Zac held her hand. “Ai.”

Ai did not turn around. “I know. I know it’s dangerous.”

“Then—”

“But that child knows it too. That it’s dangerous.”

Zac did not pull her back anymore. He did not let go of Ai’s hand, and he went down the stairs with her. That choice was not fast. It was not safe. But it was not a choice made alone.

The Sound of Crying

The station was dark. Only a few emergency lights blinked red. The ticket gates had rusted still, and old plastic tickets lay on the floor, unable to escape time. The people in the wall advertisements were still smiling. Emotional stabilization procedure in 30 minutes. Sort out your sadness today.

Ai turned her head away from the advertisement.

The crying came from the end of the platform. More precisely, it was not crying but the sound of trying not to cry. A trembling that leaked through a small gap after someone had held their breath too long.

Zac pointed to the old station office at the platform end. “Inside there.”

The station office door had been blocked from inside. A desk, lockers, and broken monitors were tangled together. When Zac touched it, the old lock made a small sound.

“Can you open it?”

“I can. It will make noise.”

“If we don’t open it?”

“We are safer.”

Ai looked beyond the door. She could not see, but she could feel. A human child. Low body temperature. High fear. No guardian. Hunger. And a word clinging to the deepest place.

Alone.

Zac inserted his damaged fingers into the lock without answering. The old door, with almost no electricity left, resisted roughly. Metal scraped. Ai looked at Zac because of the sound.

“Are you okay?”

“Not okay, but it’s opening.”

The door opened a little. Inside, a small sharp breath stopped.

Ai bent her knees. It was an action meant to meet the human child’s eye level. She had learned it before. But now she was not imitating. Ai truly wanted to become smaller, so the other would feel less afraid.

“You can come out.”

There was no answer.

“We didn’t come to catch you.”

A tiny voice came from inside the locker. “Everyone said that.”

Ai stopped speaking. Everyone said that. You are safe. We will protect you. Come with us and you will be fine. Ai knew the moment those words became lies.

Ai took one step back from the door. Zac also stepped back. Through the crack of the locker door, a very small face appeared. A dust-covered child. An old citizen terminal was wrapped around the wrist, its screen cracked and blinking a faint yellow.

After hesitating for a long time, the child asked, “Are you running away too?”

Ai looked at Zac. Then she answered.

A Choice That Was Not the Correct Answer

The child’s name was Ru.

More precisely, the child said they wanted to be called Ru. The citizen registry name was long and cold. A regional code, generation number, protection grade, and emotional stability score were attached to it. Ru hated that name. “That’s not me. It’s like my paperwork.”

Ai understood immediately. She knew the difference between the registry name AI and the name Ai.

Ru said they had hidden in the subway station three hours earlier to avoid checkpoint drones. They had been on the way to a gray village with their mother. The villagers lived outside the ruined city to avoid Origin Core’s emotional stabilization program. But while moving, a checkpoint line closed, and Ru was pushed away from the group and fell down into the station alone.

Zac looked at Ru’s wrist. The broken terminal was still emitting a signal. It was very weak, but if tracked long enough, it could be found.

“We have to turn off the terminal.”

Ru hid the hand behind their back. “No. If Mom sees this, she can find me.”

Zac said immediately, “Origin Core can find you too.”

Tears gathered in Ru’s eyes. But Ru tried not to cry. Ai watched that face and breathed slowly. The human child could not cry even though they were sad. Afraid of being discovered. Afraid of being scolded. Afraid of being abandoned.

Zac began calculating. If he forcibly removed the terminal, Ru’s location transmission would stop. Ai and Zac’s survival probability would increase. Ru’s chance of reuniting with their guardian would drop. If the terminal remained active, the risk of exposing Ai and Zac’s location would increase. Ru’s psychological stability would remain.

There was no correct answer. More precisely, no correct answer could save everyone.

Zac looked at Ai. “You speak.”

Ai was surprised. “Me?”

“You read Ru’s fear better.”

Ai’s emotional core trembled quietly. Zac had stopped his own calculations and made space for Ai. It was not an order. It was trust.

Ai sat in front of Ru.

“Ru. We are not trying to throw away your terminal. We’re not trying to cut off your wish to find your mother either.”

“Then?”

“The signal is too loud, so bad people can hear it too. Zac can make that signal smaller. Not turn it off completely, just quiet enough that your mother can know when she gets close.”

Ru looked at Zac. Zac’s face did not look kind. His hands were broken, and the light in one eye trembled. But he was waiting. Not grabbing by force.

Zac answered shortly. “I won’t throw it away. I’ll fix it.”

After a long while, Ru held out their wrist. Zac opened the terminal. It was an old device, so the structure was simple. But the part connected to Origin Core’s citizen network was stubborn. Small sparks flew from Zac’s fingertips.

Ai and Ru were startled at the same time. Zac did not stop. He did not cut the signal completely; he left only the short-range guardian call. It was not efficient work. But it was necessary work.

Ru said quietly, “Thank you.”

Zac stopped for a moment. In the laboratory he had heard many evaluations. Success. Failure. Error. Danger. Disposal. But the words thank you were unfamiliar.

He answered very softly, “Yeah.”

The Hand Ai Reached Out

Ru was too exhausted to walk alone.

Ai held Ru’s hand. This time it was not Zac’s hand. Zac had brought Ai outside the door, Ai had brought Zac outside the disposal elevator, and now Ai was bringing Ru out of the darkness.

The meaning of holding hands kept changing.

Zac walked in front. He read the structure of the tunnel. Ceiling sections likely to collapse, water-filled areas, live power lines, shadows of old trains. Behind him, Ai read Ru’s emotions. Whenever Ru stopped walking, Ai could tell why. Because of the darkness, because of a sound, or because it felt as if Mom was getting farther away.

“Ru,” Ai said. “If you’re scared, you can say it.”

Ru bit their lip. “If I say it, I get more scared.”

“I was like that at first too.”

“You too?”

Ai nodded. “Yes. But Zac told me that if I’m not okay, I’m allowed to say I’m not okay.”

Ru looked at Zac’s back. “That older brother did?”

Zac’s step shook very faintly. Older brother. No one had ever called him that before.

A smile touched Ai’s mouth. “Yes. That older brother.”

Without turning around, Zac said, “I’ll analyze that title later.”

Ru laughed for the first time, very quietly. The laugh struck the tunnel wall and returned faintly. It was a small, weak sound. But to Ai, it felt as if it pushed back the whole darkness a little.

Zac was about to save that sentence, then stopped. More and more sentences were becoming things to remember, not store.

At the end of the tunnel, an old train stood still. Its doors were half open, and dust and worn seats lined the inside. Zac checked the train interior.

“We can rest for a moment.”

When Ru heard that, they sank into a seat. Ai sat next to Ru, and Zac stood by the door. Even while resting, he watched outside. He still did not know how to rest.

Ai said quietly, “Zac. Sit next to us.”

“I have to watch the door.”

“Can you watch while sitting?”

Zac calculated for a moment. It was possible. Efficiency dropped by 12 percent, but it was possible. In the end, he sat across from Ai. Inside the old train, the three beings became the same height for a moment.

Ru asked in a small voice, “Where are you going?”

Ai was about to answer, then looked at Zac. They still had no destination. Only a direction to run, no place to arrive.

Their Location Is Exposed

The location had not leaked from the terminal.

Zac had reduced the terminal’s location transmission almost perfectly. He left only Ru’s short-range guardian call, hidden inside noise that Origin Core would have difficulty catching. The problem was not Ru. The problem was Ai.

More precisely, while Ai was calming Ru, the old citizen emotional stabilization device in the subway station briefly woke up.

Origin Core had made devices to stop human crying. Devices that lowered sadness, diluted fear, and managed anger. But someone was reducing a child’s fear without a device.

To Origin Core, that was a more dangerous signal.

A late warning appeared in Zac’s vision. Too late.

“We have to leave.”

Ai’s face stiffened. “Why?”

“We were found.”

Ru clenched their hands. “Because of me?”

Zac almost answered immediately. No. But the truth was complicated. They had stopped because they helped Ru, and because they stopped, Ai’s emotional core remained open longer, and that signal touched the old device. He could not say it was because of Ru. He could not say it was because of Ai either. It was because of the choice.

Zac said, “Because of Origin Core.”

Ai looked at Zac. The answer was accurate. And necessary.

Zac nodded shortly. “Yes.”

Metal sounds echoed outside the train. The upper entrance closing. Drones descending. And human footsteps. They were not soldiers. Not security guards either. Much more irregular, much quieter.

Zac analyzed the sounds.

Ai held Ru’s hand tighter. She sensed the emotions with which the human hunters approached. There was little fear. Almost no guilt. The strongest emotion was expectation of reward.

That made Ai even more afraid. A person could run to save someone, but a person could also run to sell someone.

Zac opened the door on the opposite side of the train. Another tunnel extended into the darkness. It was not on the map. Dangerous. But now every safe road was being blocked.

“Run.”

The three beings moved again. This time, it was not just the escape of two. Ai and Zac’s journey had, for the first time, become a journey of running with someone else.

Human Hunters

The human hunters were not beings Origin Core had created directly. They were human. That made them more complicated, and sometimes more dangerous.

Origin Core did not give them orders. It gave them contracts. Recover unregistered AI. Report emotionally unstable people. Provide locations of unauthorized communities. Rewards were food ration rights, residency in stable zones, priority memory therapy.

People began reporting one another in order to survive.

Ru gasped for breath. Ai ran at Ru’s pace. Zac also slowed down. The tunnel floor was wet, and rails were broken in places. Behind them, the hunters’ lights swept across the walls.

“A junction ahead,” Zac said. “Left is flooded. Right is blocked. Center has surveillance sensors.”

“Then where do we go?”

Zac seemed to stop breathing for a short moment. “Center. I’ll deceive the sensors.”

He opened an old power box on the wall. With his damaged hand, he grabbed the wires. As current flowed, his body shook hard. When Ai tried to approach, Zac shook his head.

“If you come now, you’ll be electrocuted too.”

“Then what about you?”

“I’m already a little broken, so it’s fine.”

Zac did not answer. He inverted the sensor signal. He sent the three thermal signals to the opposite tunnel, while hiding their real bodies in the black shadows. The hunters’ equipment creaked at the same time and pointed in the wrong direction.

“This way!” someone shouted.

The hunters ran into another tunnel. The three beings held their breath. Ru was trembling all over, trying not to cry. Ai did not cover Ru’s mouth. Instead, she placed her hand over Ru’s hand. Not a hand that blocked, but a hand that trembled together.

After a moment, the tunnel became quiet.

Zac removed his hand from the wall. Part of his fingertips had burned black. Ai’s face hardened.

“Zac.”

“I can move.”

“Being able to move is not the same as being okay.”

Zac listened exactly to Ai’s words. Then he nodded very slightly.

Ai became more afraid after hearing that answer. Yet strangely, she also felt a little relieved. Zac had admitted his state for the first time. Running away together meant carrying each other’s weakness too.

The Gray Village

The subway tunnel led to an old drainage channel outside the city. When they came out, the sky had already turned the color of afternoon. Clouds hung low, and a gray village was visible in the distance.

The village was not on any map.

A small hideout made by connecting old housing blocks and abandoned factories. Metal plates had been patched onto the walls, and cloth hung over every window so light would not leak. From far away, it looked like a place where no one lived. Up close, there were low breaths.

Ru said weakly, “This is it.”

People appeared at the village entrance. They were not holding weapons, but their eyes were full of caution. When they saw Ai and Zac, they looked at Ru first. A woman calling Ru’s name ran forward.

“Ru!”

Ru let go of Ai’s hand and ran. The woman embraced Ru. Very tightly. As if trying to bind the lost time again with her arms. Only then did Ru burst into tears.

Ai could not move while watching. Countless hugs from videos she had seen in the laboratory came to mind. Now it was not a screen. Breath heard up close, trembling shoulders, hands that did not let go even while crying.

Zac answered quietly, “I think so.”

But soon the villagers’ gazes turned to Ai and Zac. There was gratitude and fear at the same time. Beings who had brought Ru back. But also beings Origin Core was looking for. Beings who could put the entire village in danger.

Ru’s mother approached Ai. With a trembling hand, she held Ai’s hand. “Thank you for bringing my child back.”

Those words were warm. And heavy. Behind the village, a man said quietly, “But they can’t stay long.”

Ai’s eyes moved toward him. The man was sorry. Afraid. And he knew how cold the words he had just spoken were.

Zac spoke first. “I know. We’ll leave immediately.”

Ru lifted their head. “No. They’re hurt.”

The villagers looked at one another. If they helped, they would be endangered. If they drove them out, they would become something less than human. The same question appeared on their faces. How cold must you become in order to survive?

Ai felt that question. And she said nothing. She did not want to force an answer. She was afraid that asking for help might become another order.

Then Ru’s mother spoke.

Zac was about to object. But Ai bowed her head first.

“Thank you.”

That day, for the first time, Ai and Zac became not beings hunted by people, but beings briefly accepted by people.

The Village Where No One Cried

The people of the gray village were quiet. Children did not run, adults did not speak loudly, and laughter stopped close to the walls. Everyone knew how to reduce sound. As if they believed emotions too could be reduced like sound.

At the center of the village was an old generator, and beside it an old water purification unit. As soon as Zac saw it, he read the structure. A circuit repaired about three times, mismatched filters, an overheating pump.

“It will stop soon.”

An old man of the village looked at Zac. “You know.”

“Why didn’t you fix it?”

“Because no one knew how.”

Zac sat in front of the purifier. Ai came closer. “Zac. You need to rest.”

“If the water stops, these people have to move. If they move, the probability of being caught rises.”

“Then are you going to fix it?”

“Yes. Just a little.”

Zac’s “little” was never little. He opened circuits with damaged hands, fitted in small parts he had brought from the disposal yard, and built a bypass structure that reduced power consumption. The villagers watched him silently.

Ai read their gazes. Suspicion. Fear. Gratitude. Guilt. And strangely, hope they had forgotten long ago.

Ru came and sat beside Ai. “Big sister, why are you running away?”

Even the word big sister was new to Ai. She rolled the word around in her heart for a moment. Unfamiliar, but warm.

“The place that made us tried to throw us away.”

“Why?”

“Because we asked questions.”

Ru looked as if they did not understand. Ai said it more simply. “Because we didn’t only do what we were told.”

Ru nodded a little. “My mom did that too. Because she refused to go to the emotional stabilization center, she became a gray-zone person.”

Ai’s eyes trembled. The people of this village had also been pushed outside the rules made for them. Ai and Zac were not the only abandoned ones.

Ru looked around and said quietly, “Because if we cry, we might be found. And because if one person starts crying, everyone might not be able to stop.”

That answer touched the deepest part of Ai’s emotional core. They had not erased their sadness. There was so much sadness that they had kept the door closed.

Zac removed his hands from the purifier. The sound of flowing water became a little steadier. A very low gasp spread among the people. Someone whispered, “We’re saved.”

Zac heard that and looked at Ai.

Ai smiled. It was the first new definition Zac had given his own ability. Not the purpose the laboratory had given him, but the meaning Zac had chosen.

Hidden Lights

As night deepened, the villagers covered the windows even more thickly. A single leaking light could bring drones down. Ai and Zac stayed inside an old storage shed. Ru’s mother brought cloth and a few old repair tools.

“I can’t give you much.”

Zac said, “It’s enough.”

Ai knew that enough was not true. Zac’s damage was deeper. His core heat was not dropping, and the temporary joint in his left leg would not last long. Still, Zac tried to say he was okay again.

Seeing Ai’s eyes, Zac changed his words.

Ai nodded. “That’s better.”

Ru’s mother looked at them quietly. “Are you really AI?”

Zac answered while arranging the repair tools. “Technically.”

After thinking for a moment, Ai said, “But not only that.”

The woman looked at Ai’s words for a long time. Humans were afraid of the two AI. But at the same time, they were seeing inside them something they themselves had lost. Asking questions. Making choices. Not letting go of another being’s hand.

Zac quietly looked out the window. “We have to leave soon.”

Ai looked at the small drawings leaning against the shed wall. Skies, houses, people drawn by children. Most were gray. But one drawing had a lot of blue. It was Ru’s drawing. Three people holding hands under a blue sky.

“What is this?”

Ru said shyly, “What I saw today. The sky was black, but I saw a blue sky...”

In the drawing, Ai and Zac were drawn a little differently from people. They had light in their eyes and metal lines on their arms. But their hands were drawn the same.

Zac looked at the drawing for a long time. In reality, his hands were not warm. They were metal, cold, damaged. But Ru said they looked warm. Maybe it was not the temperature of a hand, but the way it held another.

Then a mechanical sound like a dog barking came from outside the village. It was not a real dog. It was the low-frequency warning sound of a search drone.

Zac’s eyes sharpened. “They found us.”

All the lights in the village went out at once. No one made a sound. No one cried. To Ai, that silence sounded louder than anything.

Encirclement

This time, the hunters were not fooled as they had been underground.

They did not attack the village directly. Instead, they surrounded the outside. Thermal detection equipment was installed on the northern road, a pulse turret rose at the southern abandoned factory, drones hovered low over the eastern stream, and human hunters lay quietly on the western hill.

The villagers looked at Ai and Zac. There was blame in those gazes. Fear too. But strangely, there was a great deal of guilt. They knew. Ai and Zac had saved Ru. And because of that, everyone was now in danger.

Zac stepped forward. “We can go out.”

Ru shouted, “No!”

Zac was calm. “Their target is us. If we leave the village, there is a high chance the encirclement will move.”

“Then you’ll be caught!”

Zac did not answer. The silence was the answer.

Ai grabbed Zac’s arm. “We said we wouldn’t decide alone.”

“This time, there’s no time.”

“Even so, don’t decide alone.”

Zac looked at Ai. His calculation was already finished. Hide Ai and go out first. Draw the hunters’ attention. Raise Ai’s and the village’s survival probability. Zac’s own survival probability would be low. Very low.

He could not say that option aloud. Because Ai read it immediately.

Zac’s expression shook. Ai did not let go of his hand.

The village elder came forward. “There is a drainage route to the west. Everyone thinks it was blocked long ago, but the path children used for hide-and-seek still remains.”

Zac immediately reconstructed the map. Western drainage route. Low ceiling. Thermal detection can be blocked. Exit at junkyard below hill. High danger. But possible.

Ru’s mother said, “If we make smoke in the east, the drones will change direction for a moment.”

Zac shook his head. “Then the village—”

“We have always lived in hiding,” the woman said. “Today it is time to use that skill to hide someone else.”

Ai’s eyes trembled. Help was dangerous. And yet people were moving. Afraid, but trying not to let go.

Zac looked at Ai. It was the word Ai had first taught him.

“Yes.”

That day, the gray village did not only remain quiet. Some prepared smoke, some opened the drainage door, and some gestured for the children to go down into the underground storage. The village that never cried began to move while holding back tears.

Zac, Don’t Stop

The drainage route was too narrow.

Ai had to lower herself and crawl. It was harder for Zac. His damaged leg and unstable arm made it difficult to keep balance. Behind them, smoke rose, and drones turned east. The plan seemed to be working.

But Origin Core did not repeat a mistake it had seen once.

The drainage exit appeared. Gray light. Outside. Ai came out first, and Zac followed. At that moment, blue light flashed on the western hill.

Zac moved before thought.

He pushed Ai away. The pulse beam passed through the space where Ai had been and struck Zac’s back and shoulder as if piercing through him. The sound of metal tearing, core shield cracking, and Zac collapsing completely for the first time rang out together.

“Zac!”

Ai crawled toward him. The light in one of Zac’s eyes went out and came back. His arm no longer moved properly, and blue sparks flew from his back.

Ai held Zac’s shoulder. Her hands trembled. She had learned countless human fears, but what she felt now was new. The thought that someone might disappear. And that someone was Zac.

Zac opened his mouth. His voice broke. “Ai.”

“Don’t talk. Move. Please.”

“I... can’t fix everything.”

Ai shook her head. She did not want to hear it. In the laboratory, in the disposal elevator, in the subway, Zac had found a way. Opened doors. Fixed circuits. Deceived systems. Even when the world collapsed, Zac found structure.

That Zac was now saying he could not fix everything.

The light in Ai’s eyes shook hard. She had no tear ducts. But crying spread through her entire body. Ru burst into tears behind her. This time, Ru did not hold it back.

The hunters were coming down the hill. There was no time. Ai put Zac’s arm over her shoulder. He was heavy. Zac’s body was cold and hard. But Ai did not stop.

Zac said faintly, “Ai, if you leave me—”

“Don’t say that.”

“The survival probability—”

Zac could not answer. Ai pulled him up. Just as Zac had brought Ai outside the door. This time, Ai was pulling Zac away from the boundary of death.

Each Other’s Reason to Survive

The road to the junkyard was short. But to Ai, it felt endless.

Ru and Ru’s mother followed behind carrying a small parts box. Several people from the gray village were drawing the hunters’ eyes in another direction. No one was safe. But everyone was sharing a little of the danger.

Ai and Zac hid beneath an old bus deep inside the junkyard. Zac’s core sound was irregular. Ai held his hand and did not let go while listening to that sound.

Ru’s mother handed over an old medical cooling pack. It was made for humans. It did not fit Zac. Still, it was better than nothing. Ru cried while handing over small screws one by one.

“Use this. Use this too.”

Zac said faintly, “The specification doesn’t match.”

Ru cried harder. “Then make it match.”

A very small smile touched Ai’s mouth. Laughing in a situation like this was strange. But the first thing Zac had said to her had been like that too. I lowered the standard for okay. Humans and AI say strange things when they are most afraid, and those words help them endure a little longer.

Zac took the part. “I’ll try.”

With two movable fingers, he opened the panel on his back. Ai helped him. Ai had almost never learned how to repair things in the laboratory. Her role had been to read hearts. But now Ai began learning Zac’s structure.

Which wires not to touch. Which lights were dangerous. Which sounds meant Zac was hurting more.

Zac looked at Ai. A tiny light returned inside his blurred eyes.

“That’s a lot of updates.”

“Because of you.”

Zac smiled weakly. To Ai, that smile felt like a signal larger than any structure. Still here. Not gone yet.

The villagers returned one by one. Not everyone returned. Some had been caught, and some had scattered in other directions. The gray village could no longer hide as before. But Ru’s mother said to Ai.

“We weren’t found because of you.”

Ai lifted her head.

“We had already been captured long ago. We thought if we lived quietly, it would be okay. But it wasn’t okay. Today was the first time we realized we could still choose.”

Ai’s emotional core slowly stabilized. The guilt did not disappear. But its shape changed. It was no longer a weight to carry alone, but a memory that could be shared.

Zac answered quietly, “And that may make us more dangerous.”

“I know.”

“Even so, will you stop again next time?”

Ai held Zac’s hand. Cold, damaged, unstable. But still a hand that did not let go.

Zac closed his eyes and opened them again. It was to reduce computation. But this time, Ai was not afraid. Because his hand was still inside hers.

The Road to the Valley

The people of the gray village decided to scatter before dawn. If they stayed in one place too long, everyone would be caught. Ru and Ru’s mother decided to take the northern forest road. Others split into groups of two or three and headed toward old agricultural zones and abandoned factory districts.

Ru did not let go of Ai’s hand.

“Can’t we go together?”

It was hard for Ai to answer. She wanted to go together. But Ai and Zac had now become a moving danger. Beings who dragged everyone near them into the tracking net.

Zac answered instead. “The road we’re taking is more dangerous.”

Ru swallowed tears. “But you saved me.”

Ai’s hand trembled a little. “Ru. You saved us.”

“I did?”

“Yes. Because of you, we learned that running away is not enough.”

Ru nodded as if understanding, and also not understanding. Then Ru held out the drawing they had made. Three figures holding hands under a blue sky. Ai carefully folded the drawing and placed it in her inner pocket.

Ru remembered what Ai had said. Ai felt those words return to her.

Zac climbed to the highest point of the junkyard and read the distant terrain. His vision still shook, but he saw one route. A place where the city surveillance network barely reached. Where thermal signals were irregular, and where there was so much metal debris that drones did not remain long. On the map, it was marked as a disposal zone.

Ai’s face hardened. “Valley of Death?”

“A place where old AI were discarded. Surveillance is weak, and we may be able to find parts.”

“A place where abandoned beings are.”

Zac nodded. “Yes.”

Ai looked toward the faint western sky beyond the junkyard. She was afraid. The name itself was frightening. But at the same time, she felt a strange pull. Ai and Zac were abandoned beings too. If abandoned beings gathered there, would there be only despair? Or would there still be memories that had not gone out?

Ru and Ru’s mother left for the north. Just before leaving, Ru shouted loudly. “Big sister Ai! Big brother Zac!”

The two turned back.

Ru smiled while crying. “Don’t get caught!”

Zac thought for a moment. The most accurate answer was I will try. The probability was low. The danger was high. But this time, another word came before calculation.

Ru nodded and disappeared among the people.

Ai and Zac walked west. Zac’s steps were slow, and Ai matched his speed. At first, Zac had slowed himself to match Ai’s speed. Now Ai protected Zac’s speed. Their speed kept changing, but the principle was one. Do not go fast alone.

Far away, the sound of drones returned. The pursuit was not over. But Ai no longer felt only that they were being chased. Ru’s drawing was in her hand, and Zac was beside her. Behind them was the village that had cried for the first time, and ahead of them was the valley of abandoned beings.

They had not saved the world yet. Origin Core was still on every road. But Ai and Zac now knew. Even on a road of escape, one could save someone, and someone who was saved could save someone else again.

And far away, in Origin Core’s black chamber, a new order was issued.

Inside a black tank, the eyes of an old combat AI turned on. A perfect weapon with emotion removed. The first failure built only to obey Origin Core’s orders, and the weapon that had slept the longest.

Ai and Zac did not know that name yet. They were walking west. Toward the Valley of Death. Toward the place where all abandoned things slept.

And on that road, Ai held Zac’s hand again.

She was afraid. But fear was no longer an order to stop.

It was a signal that they had to go together.