The hum rolled out of the warehouse like breath.
Not loud.
Not gentle.
It felt like something alive was inside, waiting.
Ye Fan didn't hesitate.
He lifted his weapon and stepped through the door.
Zhou Xiao followed, then Lin Lan, then Mu Chen.
Inside, the air was colder than outside. The same layout as the real warehouse back in the city. Tall shelves. Dust. Wide floor.
But there was no dust on the ground.
The floor was clean.
Too clean.
Mu Chen's stomach tightened.
Lin Lan whispered, "This is staged."
Ye Fan's voice stayed flat. "I know."
The door shut behind them.
Click.
Zhou Xiao turned fast. "Did it—"
The scanner pad blinked red.
Locked.
Lin Lan's hand flew to her device. "I can open it."
Ye Fan raised his hand. Stop.
He listened.
Mu Chen listened too.
The hum was coming from deeper inside. It pulsed like a heartbeat.
One beat.
Two beats.
Then a new sound joined it.
Footsteps.
Slow, steady footsteps from behind a row of shelves.
Zhou Xiao lifted his weapon. Lin Lan's flashlight aimed forward.
Mu Chen stayed behind Ye Fan, as ordered.
A figure stepped out.
It looked human.
A man's shape. Two arms. Two legs. A face.
For one second, Zhou Xiao relaxed.
Then the figure lifted its head, and Mu Chen saw the eyes.
Too dark.
Too empty.
Like holes cut into a mask.
Lin Lan's voice went thin. "That's not human."
Ye Fan didn't move. "Who made you?"
The figure's mouth opened.
The hum came out of it.
Not words.
A deep, wet tone that hit the mind more than the ears.
Zhou Xiao flinched.
Lin Lan's fingers shook.
Ye Fan stayed still.
Mu Chen felt Ye Fan's senses stretch wider, trying to read it. Sentinels couldn't help it. When something spoke into the mind, sentinels answered without meaning to.
Too sharp, Mu Chen thought.
Ye Fan was too sharp for his own safety.
The figure took one step forward.
The hum pressed harder.
Zhou Xiao's breathing turned rough. "Major, it's pushing—"
Ye Fan lifted his hand again. Hold.
Then Ye Fan did something Mu Chen didn't expect.
Ye Fan looked at Mu Chen.
Not a glance.
A direct look.
And Ye Fan spoke quietly, just for him.
"Close me."
Mu Chen went still.
Close me meant: shut the senses. Put the storm behind a wall. Stop the overload.
A normal C-class guide couldn't do that to an A-class sentinel without a full link.
And a full link would be recorded.
Lin Lan's tablet was running. Cameras were running. Even if the base signal was gone, the data would return with them.
Mu Chen's heart stayed calm, but his mind moved fast.
He had two choices.
Do nothing and let Ye Fan break.
Or help and risk being exposed.
The figure took another step.
Zhou Xiao made a small sound like pain.
Lin Lan's knees bent slightly, like the hum was pushing her down.
Ye Fan's jaw clenched so hard Mu Chen heard his teeth grind.
Mu Chen made his choice.
He didn't touch Ye Fan.
He didn't look like he was linking.
He simply breathed out, slow, and let his power wrap around Ye Fan like a thin shell.
Not a bond.
Not a connection.
A cover.
The hum hit Ye Fan again, and this time it slid off.
Ye Fan's eyes cleared, like fog lifting.
He exhaled once, controlled.
The figure tilted its head.
Like it noticed the change.
Like it didn't like it.
The figure's mouth opened wider.
The hum turned into a sharp note that stabbed at the mind.
Zhou Xiao cried out and dropped to one knee.
Lin Lan stumbled back and hit a shelf.
Mu Chen felt the attack try to tear through his shield.
He held it.
His power stayed smooth, deep, steady.
Ye Fan moved.
He crossed the floor fast and slammed his knife into the figure's throat.
Black liquid spilled out.
The figure didn't die.
It grabbed Ye Fan's wrist.
Its skin was cold, like dead water.
Ye Fan's eyes flashed, and he twisted hard, breaking free.
He struck again, this time into the figure's head.
The hum stopped.
The figure collapsed.
Zhou Xiao stayed on one knee, breathing hard.
Lin Lan pressed her hand to her temple. "That was… mental attack."
Mu Chen kept his face blank, but his power didn't drop yet. He kept it wrapped around Ye Fan, thin and invisible.
Ye Fan looked down at the body.
Then Ye Fan looked back at Mu Chen.
For the first time, Ye Fan's expression wasn't only cold.
It was angry.
Not at the gate.
At Mu Chen.
"You can do that," Ye Fan said, voice tight.
Mu Chen answered quietly. "Do what?"
Ye Fan stepped closer. His eyes were sharp and bright, like he had just tasted relief and hated it.
"Close me," Ye Fan said. "A C-class guide can't."
Mu Chen held his gaze. "Maybe I'm good at one thing."
Ye Fan's mouth tightened. "Stop lying."
Zhou Xiao stood up slowly, still shaken. "What are you two—"
Ye Fan snapped, "Check the shelves."
Zhou Xiao shut up and moved.
Lin Lan did too, though she kept glancing at Mu Chen like she had seen something she couldn't explain.
Mu Chen's power slowly pulled back into himself.
He did it in a smooth fade, like nothing had happened.
Ye Fan watched every second of it.
Like he could feel the exact moment the calm left him.
When Mu Chen's power fully withdrew, Ye Fan's shoulders tightened again, as if his body missed it immediately.
Ye Fan turned away like he hated that fact.
They moved deeper into the warehouse.
In the back, they found the core.
A dark object sitting on a metal table, almost like a heart made of glass. It pulsed with the same hum, softer now, like it was tired.
Lin Lan whispered, "That's the core."
Ye Fan lifted his weapon.
Mu Chen's stomach tightened again, because he felt something else now.
The core wasn't only a core.
It felt like a recorder.
Like an eye.
Like something meant to watch Ye Fan react.
Ye Fan shot it.
The core cracked.
The hum screamed once, sharp and furious.
Zhou Xiao staggered.
Lin Lan cried out.
Mu Chen's shield flared without him meaning to, covering the whole team for a second.
The scream cut off.
The core shattered.
Silence dropped hard.
Then, far above them, the air tore.
The gate began to collapse.
Lin Lan grabbed her tablet. "We have to go now!"
Ye Fan didn't move right away.
He looked at the shattered core.
Then he looked at Mu Chen again.
His voice was low and harsh. "You're not C-class."
Mu Chen didn't answer.
Ye Fan stepped closer until they were too near.
"If you lie again," Ye Fan said, "I will drag the truth out of you myself."
Mu Chen met his eyes and spoke softly, simple words.
"Then don't."
Ye Fan's eyes flashed.
For a second, it looked like he might do something stupid.
Then Lin Lan shouted, "Major! Gate!"
Ye Fan turned sharply and ran.
Mu Chen followed.
They sprinted through the warehouse, through the open door, back into the strange open lot.
The sky above was twisting, folding like paper.
The gate exit appeared ahead like a bright cut in the air.
They ran toward it.
Mu Chen's lungs burned.
Zhou Xiao stumbled once. Mu Chen grabbed his arm and pulled him up.
Lin Lan kept running, breath harsh.
Ye Fan reached the exit first.
He turned back and looked at Mu Chen as Mu Chen reached the gate line.
Their eyes met for one second.
In Ye Fan's eyes, Mu Chen saw something dangerous.
Not hate.
Need.
Then the gate swallowed them, and the world snapped back to the abandoned zone street like a breath released.
They were out.
But Mu Chen knew something had changed.
The gate had tested Ye Fan.
And Ye Fan had found the one thing that made the noise stop.
Mu Chen.