The narrow passage felt tighter with every step.

  Not because the walls were moving—at least, not yet—but because sound behaved strangely here.

  Every breath, every scrape of boot against metal, seemed to linger just a fraction too long, as if the corridor were reluctant to let go of it.

  Z-69 walked in the middle.

  Ten was half a step behind him, Jin half a step ahead.

  None of them had agreed on that formation.

  It had simply happened, the way animals arranged themselves without speaking when danger was close.

  Along the right wall ran three parallel claw marks, deep and straight.

  Someone had carved them with care, not in panic.

  Further ahead, the floor bore faint skid marks, as if someone had lost their footing and tried desperately to stop themselves from being dragged.

  Ten stared at those marks longer than he should have.

  “Someone… tried to get out.” he whispered.

  Jin glanced back. “Or tried to get in. Either way, they didn’t walk out calmly.”

  Z-69 stopped.

  Not abruptly—just enough to make the others halt as well.

  He studied the corridor ahead.

  The light overhead was steady for now, but the shadows at the edges seemed thicker, heavier, as if they were pooling instead of simply forming.

  “This section.” Z-69 said quietly, “isn’t meant for running.”

  Ten swallowed. “How can you tell?”

  “The sound,” Z-69 replied. “It echoes too well.”

  Jin frowned. “That’s… not reassuring.”

  They moved again, slower this time.

  At the end of the passage stood a small steel door.

  No visible lock.

  No keyhole.

  Just a handle and a faintly glowing sensor panel beside it.

  The wall around the door was scarred with old scratches—some shallow, some deep.

  On the floor beneath, metal dust had been smeared into dark streaks by countless hands and feet.

  Jin stepped forward without thinking and grabbed the handle.

  The door responded instantly.

  A sharp beep cut through the corridor, and a red light flared across the sensor panel like an eye snapping open.

  The handle locked in place, immovable.

  Jin cursed under his breath. “Yeah, of course.”

  Z-69 tried next.

  The same reaction.

  Red light.

  Rejection.

  He stepped aside.

  Ten hesitated.

  The moment Ten’s fingers hovered near the sensor, the air changed.

  It wasn’t dramatic—no alarms, no flashing lights—but Ten felt it immediately, like pressure against his chest.

  The faint hum of the labyrinth sharpened, focusing around him.

  When Ten finally touched the panel, the door emitted a soft, continuous tone instead of a rejection beep.

  Ten flinched.

  Behind them, even though the lights were still on, shadows along the corridor walls shifted—just slightly—like something adjusting its posture.

  Stolen story; please report.

  Jin’s jaw tightened. “The door only reacts to you.”

  Ten’s heart started to race, and he hated himself for it.

  The overhead lights flickered.

  Once.

  Ten’s breath caught.

  Jin clenched his fists.

  Flicker.

  Twice.

  Z-69 glanced at Ten—not an order, not a command, just a question.

  “Can you?”

  Flicker.

  Three times.

  The lights went out.

  Darkness collapsed over them like a lid.

  The corridor vanished.

  Sound didn’t.

  From somewhere close—too close—came the faint click… click… of metal touching metal.

  Slow.

  Patient.

  Moving with purpose.

  Ten felt it instantly.

  The sound wasn’t searching.

  It was approaching.

  A pillar of red light flared to life behind them, some distance away, painting the corridor in a narrow, blood-colored glow.

  Jin didn’t hesitate. “Out. Now!”

  Z-69 grabbed Jin’s arm and yanked him back toward the red light.

  Ten stayed where he was.

  The door in front of him began to beep again, faster this time, the tone rising and falling like an impatient pulse.

  From the darkness behind him came a scraping sound.

  Scratch… scratch…

  Like fingernails tapping against a door from the other side.

  Ten’s throat locked.

  Z-69 turned sharply. “Ten.”

  Ten shook his head.

  “I’ll stay.” he said, voice thin but steady.

  Jin stared at him as if someone had struck him.

  “Kid, don’t—”

  Ten closed his eyes and inhaled slowly.

  Then exhaled even more slowly.

  Z-69 had drilled it into him since Floor 4: don’t chase fear—make fear chase you.

  Ten pressed his palm flat against the sensor.

  The door trembled.

  This time, the darkness slid past Z-69 and Jin, ignoring them completely, and wrapped around Ten like freezing fog.

  He could feel it brushing his clothes, his skin, tasting him.

  Ten bit down hard on his lip to keep from making a sound.

  The door opened just enough for a person to slip through.

  Ten stepped inside.

  The moment he did, Jin swore and surged forward—

  Z-69 stopped him with one hand.

  Not forcefully.

  Just enough.

  “If you rush in.” Z-69 said quietly, “both of you die.”

  Jin’s hands shook.

  His teeth were clenched so hard his jaw hurt.

  “He’s just a kid.”

  Z-69 didn’t look away from the door.

  “Trust him.”

  Inside, the room was small.

  Too small to feel like a reward.

  The air was icy, cold enough to sting Ten’s lungs.

  The walls were bare metal, crisscrossed with claw marks at different heights—some high, some low, some overlapping like desperate handwriting.

  In the center of the room floated a faintly glowing green key.

  No pedestal.

  No chain.

  Just hovering there, rotating slowly.

  Ten took a step toward it—and nearly slipped.

  The floor beneath him was scratched, gouged by frantic movements.

  In one corner lay a dark smear, half-cleaned, half-forgotten.

  Someone had bled here.

  Someone had died here.

  On the wall, scratched so lightly it almost blended into the metal, was an unfinished message:

  Don’t—

  Ten’s chest tightened.

  He forced himself to breathe.

  In.

  Out.

  When he reached for the key, it recoiled slightly, like a living thing reacting to touch.

  The cold intensified, biting into his fingers.

  The moment his hand closed around it, warmth flooded his palm—artificial, controlled, like energy being injected directly into his veins.

  The room shook.

  Outside, footsteps erupted—fast, eager—as if the labyrinth had just marked him.

  Ten didn’t think.

  He ran.

  He burst through the door just as the lights snapped back on.

  Yellow illumination poured down.

  Ten stood there, clutching the blue key, his face pale as death.

  His hands shook—but his eyes held something new.

  Not relief.

  Not joy.

  I did it.

  Jin stared at him for a long second, then exhaled hard, like he’d been drowning.

  He stepped forward and punched Ten lightly in the shoulder. “Idiot.”

  Ten let out a shaky laugh. “I know.”

  Z-69 said nothing.

  He nodded once.

  They moved on.

  The labyrinth didn’t make it easy.

  It remembered them.

  When they chose narrow corridors repeatedly, those paths began to fill with subtle obstructions.

  When they rushed toward red zones too early, the red zones appeared farther away.

  The maze wasn’t just shifting.

  It was responding.

  Eventually, they entered a wide, circular chamber.

  Four exits.

  Smooth metal walls.

  And at the center, atop a short steel pillar, lay a red key.

  It was obvious.

  Too obvious.

  Jin snorted. “No way.”

  Ten’s skin crawled. “It wants us to take it.”

  Z-69 studied the room.

  The pillar bore countless scuff marks, as if many hands had reached for that key before.

  Beneath it, a thin seam traced a perfect circle in the floor.

  A trapdoor.

  Then the lights flickered.

  Once.

  The shadows around the room thickened.

  A red light flared in one corner—a safe zone barely large enough for three people to stand shoulder to shoulder.

  They moved into it instinctively.

  This time, the lights didn’t come back on.

  The darkness didn’t stay still either.

  It circled.

  Claws scraped along the walls—scratch scratch scratch—slow and rhythmic, like something drawing a boundary around them.

  Ten’s breathing quickened despite his efforts.

  Immediately, something slammed into the edge of the red light.

  The light wavered.

  Jin stared at the red key.

  Understanding dawned.

  “This time.” he said quietly, “waiting won’t save us.”

  Z-69 met his gaze.

  No argument.

  No warning.

  Jin crouched.

  Then he vanished.

  In a blur of motion, he dashed from the red zone, snatched the red key—

  And the floor beneath him opened.

  Jin fell.

  Wind screamed upward from the pit.

  Ten cried out.

  The red light shook violently, flickering like it might die.

  Z-69 rushed to the edge of the pit, staring into darkness.

  A second later, a door on the far side of the chamber burst open.

  Another red light flared.

  Jin staggered out.

  He was alive.

  But in his hand was not the red key.

  It was a rusted piece of metal, dull and lifeless.

  A false key.

  Jin stared at it.

  Then he dropped it.

  The sound of metal hitting metal echoed sharply through the chamber.

  The lights came back on.

  Ten ran to him. “Are you hurt?”

  Jin didn’t answer immediately.

  He looked at the false key on the floor, then at Ten, then at Z-69.

  Understanding settled in like ice.

  The labyrinth hadn’t wanted a sacrifice.

  It had wanted a choice.

  And no choice here was clean.

  Ten looked down at the blue key in his hand.

  He wondered—Is this one actually real?

  Of course, the labyrinth, silent and patient, did not answer that.