Mira stepped out of the dust like she'd already decided the outcome.
Jaehyuk was still breathing hard from the ambush. One Vanguard scout on the ground. Two more backing away. Somin's healing light still clung to the air around his torn shoulder, warm and sharp, like metal pulled from a fire.
Mira looked at the bodies. Then at him.
"You saw that coming," she said.
Jaehyuk wiped blood from the corner of his mouth. "You noticed late."
Somin made a small noise. Half relief, half panic. "Can we maybe not do the part where everyone acts like they're arguing in a storm drain? My heart is doing very bad things."
Mira didn't look at her. "You knew about the ambush too?"
"No," Jaehyuk said. "I knew the corridor was wrong."
"That's not an answer."
"It's the one you get."
Mira stared at him for a beat too long. Then her eyes moved to the broken arch ahead, where the floor's stone seams made a narrow line across the path.
"Vanguard already mapped three routes through this floor," she said. "Two are trapped. One is slow."
"Three is also trapped," Jaehyuk said.
She looked back. "How do you know?"
He tapped his thumb against his index finger. Once. Twice.
"Because Floor 5 likes speed," he said. "And because that corridor only looks like a shortcut if you don't know where the bodies are meant to fall."
Somin hugged her healer kit to her chest. "That is the worst thing you could have said in the nicest possible voice."
"It wasn't nice."
"It was a little nice."
Mira's gaze sharpened. She'd seen the ambush pattern. She'd seen him call it out before the bolts flew. That was enough for her to stop pretending this was coincidence.
"Move with us," she said.
Jaehyuk blinked once. "No."
Somin looked between them. "Oh, this is happening fast. I hate that I'm excited."
Mira's expression didn't change. "For one floor."
"That's still no."
"I'm not joining you."
"I didn't ask."
"I'm using you."
Somin made a strangled sound. "Wow. Okay. Honest. Terrifying. Efficient."
Jaehyuk looked at Mira. She looked back like she'd already measured the distance between them and found it acceptable.
"You know the layout," she said. "You know what kills people here. I don't care why."
"Bad policy."
"It's a floor, not a confession booth."
Somin raised one hand. "Can I just say, as the person most likely to need stitching later, I support anyone who wants fewer exploding hallways?"
Jaehyuk exhaled through his nose. "You're sure about this?"
Mira answered immediately. "No commitment. One floor. If you become a problem, I leave."
"That sounds like commitment with extra steps."
"It's not."
Somin pointed at both of them. "This is already the weirdest group I've ever been in, and I once got trapped in a practice room with three people fighting over a vending machine."
Mira ignored that. Her eyes stayed on Jaehyuk.
She'd decided he was useful.
That was enough for now.
"Fine," Jaehyuk said. "But you follow my calls. Exactly."
Mira's mouth flattened. "You're giving orders already?"
"Only when I'm right."
Somin sighed like she was watching a disaster become paperwork. "Great. Love this. Very healthy energy."
They moved.
Floor 5 was all broken stone and narrow lanes, old fortress corridors wrapped around a central keep. The Tower had decided this one should feel elegant. Instead it smelled like damp rock, old iron, and the sour sweat of too many climbers pretending not to be afraid.
The air was colder in the side passages. It carried dust on the back of the tongue. Every step scraped grit underfoot.
Jaehyuk took the lead without asking permission.
Mira took the rear without needing to be told.
That was the first surprise.
The second was that she adjusted to his pace after twelve seconds.
Not politely. Not warmly. Just there. He slowed, she slowed. He stopped at a seam in the wall, she stopped too. Somin blinked at both of them and hurried to catch up, boots whispering over stone.
"You're not even arguing," Somin said.
"Give it time," Jaehyuk muttered.
Mira asked, "What's the route?"
Jaehyuk ran a thumb over the wall seam. Rough. Dry. Beneath it, faint vibration. Trap channel. "Left fork. Then through the narrow hall. Don't touch the blue markings."
"There are no blue markings."
"Good."
Mira looked at him sideways. "That sounded like a joke."
"It was."
Somin made a soft, delighted sound. "Oh, I like when he does that. It's like being handed a knife with a ribbon on it."
Jaehyuk glanced back. "You should stop saying things like that out loud."
"Why? Because it makes you seem nice?"
"No. Because it makes you seem dangerous."
Mira snorted once. It was almost nothing. Still there.
They rounded the left fork just as three stone darts shot from the ceiling into the path behind them.
Somin yelped.
Mira's blade was already moving. One slash. Two. The first dart split. The second ricocheted into the wall. The third buried itself in the floor where Jaehyuk had been standing a half-step earlier.
"Keep moving," he said.
Somin patted her chest. "I'm trying! My heart is trying to leave me behind!"
"Let it," Mira said.
Somin stared at her. "That's rude."
"It's practical."
"It's still rude."
Jaehyuk didn't answer. He was listening.
Not for footsteps. For the Tower.
The fifth floor had a rhythm if you knew how to hear it. Stone pressure. Wind flow through the vents. The small click of hidden seams settling after a trigger reset. Most climbers heard only silence until the floor ate them.
Jaehyuk heard the lie under the silence.
He lifted a hand. The trio stopped.
Mira's sword came up at once. No question. No delay.
Somin whispered, "Okay, that was hot. Terrifying, but hot."
"Quiet," Jaehyuk said.
A second later, a black thread snapped across the hall at ankle height.
Mira cut it before anyone could step forward.
The thread sang when it broke. Sharp. Thin. Almost invisible.
Somin swallowed. "I hate that."
"Good," Jaehyuk said. "It's for killing."
Mira crouched, eyes narrowing. "Pressure lattice."
"You know it?"
"Not this room. The pattern."
That was new. Jaehyuk glanced at her. Mira was already tracing the floor with her gaze, reading angles, counting seams.
She wasn't following him blindly. She was learning the floor faster than most people could panic.
Fine.
That worked.
"Step where I step," he said.
"I wasn't planning to freestyle."
Somin raised a hand. "Can I ask a basic human question? Are we going to the boss room or the murder room first? Because I feel like both are on the menu."
Jaehyuk pointed to the hall ahead. "Same room. Different mood."
Mira looked at him for one second. "You're awful."
"Still alive."
They crossed the lattice one careful step at a time.
The pressure under the boots felt wrong. Too soft in some places, too stiff in others. A thin vibration crept up through the soles and into the knees. Even the air tasted different here, metallic and dry, like licking the back of a spoon.
Somin whispered while walking, "If I survive this, I'm eating something with sugar in it."
"You always say that," Jaehyuk said.
"I always mean it."
"Then one day you'll be delighted."
Mira glanced back. "You two do this often?"
"Do what?" Somin asked.
"Talk while walking through a kill zone."
Somin smiled nervously. "Yes? No? I'm honestly not sure. It feels like this is our whole relationship now."
Jaehyuk said, "It works."
"Barely," Mira said.
"Still works."
They reached the far side of the hall. Jaehyuk exhaled once. Not relief. Just a pause.
Ahead, the corridor widened into a circular chamber with a stone dais at the center. Runes glowed faintly under cracked marble, and the door beyond it was sealed by a rotating lock made of Tower steel.
A boss room.
And a speed trial.
Jaehyuk could feel it in the floor. In the air. In the way the chamber held its breath.
Mira saw it too. Her shoulders settled. Ready.
Somin swallowed, then muttered, "I miss the days when my biggest problem was group projects."
"Focus," Jaehyuk said.
The door behind them slammed shut.
Stone scraped. Gears turned inside the walls. A chorus of thin bells rang from nowhere and everywhere at once.
Then the Tower spoke.
[Floor 5 Core Trial: Clear the Keep in under 12 minutes]
[Failure Condition: Active suppression]
[Objective: Protect the burden carrier]
Somin frowned. "Burden carrier?"
Jaehyuk's eyes flicked to the chamber floor.
One of the runes had lit up under his boot.
Mira saw it a half-second later. Her blade came down and shattered the stone mark before the chamber could respond.
Too late.
The floor groaned.
A deep mechanism shifted beneath the dais, and a section of the wall folded open to reveal a corridor lined with spinning blades.
Fast. Very fast.
Mira smiled without warmth. "That's more like it."
Jaehyuk looked at the corridor and then at the pressure lattice seams around the dais.
"The wrong person carries the wrong burden," he murmured.
Somin's voice went small. "That sounds bad."
"It is," Jaehyuk said.
Mira stepped beside him, already adjusting her grip. "Tell me where to stand."
He glanced at her.
No hesitation. No pride.
She wanted the answer. Not comfort. Not reassurance. Just the shortest path to the next kill.
"Left," he said. "I'll call the turns. Somin stays centered. Don't let the core mark touch her."
Mira nodded once.
Not at him. At the floor.
Then she moved.
The spinning corridor hit like a sawblade storm.
Mira went in first.
Steel flashed. Her sword struck once, twice, three times, each cut timed to the corridor's spin so neatly it looked insulting. One blade clipped her sleeve. She didn't even blink.
"Now," Jaehyuk said.
She shifted left on the exact beat he called.
A hidden panel opened under the corridor floor. If she'd been one step off, it would've taken her ankle.
Instead she drove her blade down through the seam and pinned the mechanism.
The whole passage jolted.
Somin winced from the rear. "I can feel that in my teeth."
"Good," Jaehyuk said. "It means the floor's nervous."
Mira shot him a look. "You say strange things."
"It's a skill."
The corridor kept throwing blades. Mira kept meeting them.
Not blocking. Meeting.
She used the sword like a key, not a shield. Every impact bent the machine's rhythm. Jaehyuk called the turns. Somin's small healing pulses snapped over Mira's forearm when the steel grazed too close, over Jaehyuk's wrist when a dart nicked him from the side.
Her hands were shaking by the third pulse.
Not from fear.
From strain.
"Hold," Jaehyuk said.
Somin pressed one palm to her own chest and the other into the glowing seam of her skill. Light spread across the chamber in a thin, warm wash. Not enough to heal a broken bone. Enough to keep Mira's muscles from locking up.
Mira glanced back. "You're overextending."
Somin gave her a breathless smile. "I know. I'm doing it anyway."
That earned the smallest pause from Mira.
Then she turned back to the corridor and kept cutting.
Jaehyuk caught the smell of ozone when the next trap fired. Sharp and burnt. A Tower discharge. He ducked, felt the shock bite through the air behind his neck, and tasted copper where his lip had split again.
Floor 5 didn't want a long fight.
It wanted a clean one.
That meant the Tower thought it knew the shape of the answer.
Jaehyuk knew better.
"Left edge," he said. "Third seam. Mira, break the wall there."
She did it without asking why.
Stone exploded inward. Dust blasted across the room. Under it, a hidden gear shaft turned once, twice, then jammed with a horrible grinding scream.
The corridor stuttered.
"Again," Jaehyuk said.
Mira's sword slammed into the next seam. The chamber shuddered.
Somin was breathing hard now. Her voice came out in little bursts. "I swear. If this floor has another surprise, I'm. Going. To. Bite. Someone."
"Use your anger," Jaehyuk said.
"I am using my anger."
"Good."
Mira cut through the last blade array, then pivoted to the central dais. The core mark there pulsed red, a small crystal heart wrapped in Tower steel.
Burden carrier.
The thing the floor had chosen.
Jaehyuk saw the logic at once.
The core was meant to slow the fastest party member. Force someone to carry a delay field. Turn speed into weight. Make the "right person" carry the "wrong burden."
He almost laughed.
Of course the Tower would get poetic when it wanted to kill you.
"Mira," he said. "Take the core. Somin, stay on me."
Mira didn't ask if he was sure. She just moved, slashed the steel casing, and ripped the crystal from the dais.
The chamber screamed.
Not metaphorically.
The walls shook with a high ringing note. The floor became heavy underfoot. The air thickened, pushing against the lungs, the skin, the teeth.
Mira flinched once. Then her posture corrected. She looked down at the core in her hand.
"It's weightless."
"Not for long," Jaehyuk said.
The corridor behind them reopened.
This time the blades were faster.
Mira stepped forward with the core in one hand and the sword in the other. "Then we move."
They did.
Down the corridor. Through the narrowing pressure. Past the grinding gears and the hot iron smell and the noise of stone trying to tear itself apart.
Somin's healing light kept flickering at the edges of her fingers. Every few seconds she pressed it into Jaehyuk's arm or Mira's shoulder, just enough to keep them from falling apart.
"Keep talking," she panted.
Jaehyuk glanced back. "About what."
"Anything."
Mira said, "This is not a conversation."
"Perfect," Somin said. "Talk anyway."
Jaehyuk almost smiled. "You're ridiculous."
"Thank you. I work hard at it."
Mira cut down another blade, then shifted half a step closer to Jaehyuk when the next trap lined up wrong. Not to protect him. To take the angle.
He saw it.
She'd adjusted without thinking.
Or without showing the thought.
Either way, it mattered.
The final chamber opened ahead.
The boss was waiting.
A massive armored construct, all steel limbs and a crown of spinning gears, rose from the floor beside the exit gate. Its body was built for motion and its eyes were narrow red slits that tracked the trio with mechanical impatience.
Fast boss. Speed trial. Bad combination.
Its first strike came before the doors fully opened.
Mira met it head-on.
The impact rang through the chamber like a bell struck with a hammer. Steel met steel. Sparks flew hot enough to sting the face. The smell of burnt metal flooded the air.
Jaehyuk shouted, "Left leg first. The joint locks after three hits."
Mira was already there.
One cut. Two. Three.
The boss lurched.
Somin gasped, then slammed her palms together and threw a healing wave into Mira's back when the construct's shoulder spike clipped her side. Mira didn't turn. Didn't thank her. Just kept moving.
That was fine.
Gratitude could wait.
The construct swung again. Jaehyuk slipped inside its reach and stabbed at the seam behind the knee with a broken dagger he'd picked up from the corridor floor. Useless weapon. Good angle.
The blade barely penetrated.
Enough.
The construct staggered.
Mira drove her sword through the exposed joint.
The sound was awful. Crunching steel. Screeching gears. A deep mechanical howl that rattled the ribs.
It fell one knee at a time.
Then Jaehyuk saw the second pattern.
"Don't finish it yet," he snapped.
Mira's head turned. Just a fraction. "Why."
"Because it's baiting the floor seal."
The boss's chest split open.
A burst of compressed force blew across the chamber. Somin cried out as the shockwave caught her healing stance and threw her back into the wall.
Jaehyuk's ears rang. He tasted blood and dust.
Mira still stood.
Barely.
She planted the sword in the floor and used it to stay upright. The core in her other hand had begun to pulse white-hot.
"It's charging," she said.
"Yeah," Jaehyuk replied. "That's why I said don't finish it yet."
Mira looked at him like she was deciding whether to be angry later.
Then she nodded once.
Fine. Later.
The construct rose again, slower now. Damaged. Angry. The room's seals were tightening around it, trying to force the final exchange.
Jaehyuk shoved a hand under Somin's elbow and hauled her up. Her breath hitched. Her palms were slick with sweat. She smelled like iron and herbs and the faint citrus balm she always kept in her kit.
"You okay?" he asked.
"Absolutely not," she said. "But I'm here."
"Good."
"Is that your version of comfort?"
"No. My version is worse."
Mira moved first this time, using the boss's own recoil to slide in under its guard. Her sword flashed once. Twice. The third strike went straight through the crystal seam in its chest.
Jaehyuk saw the exact moment the machine lost its center.
"Now," he said.
Somin pushed healing into both of them at once, a sharp bright burst that steadied Mira's stance and pulled the ache out of Jaehyuk's cracked ribs just enough to let him move.
The boss broke.
Not explosively. Not cleanly. It folded inward with a shuddering crack, gears grinding down like teeth on stone.
Then the Tower let the silence drop.
For two whole seconds, nobody moved.
Then the floor gate chimed open.
[Floor 5 Clear]
[Clear Time: 8:41]
[Reward Allocation Pending]
Somin bent forward with both hands on her knees. "I hate this place. I hate it so much. I want soup."
Jaehyuk leaned against the wall. His hands were shaking again. Not fear. Fatigue.
Mira looked at the clear notice, then at the broken boss behind them, then at Jaehyuk.
"Eight minutes," she said.
"Forty-one seconds."
"You knew the floor."
"Yes."
"You knew the boss pattern."
"Yes."
"You knew the ambush."
"Yes."
Mira's eyes narrowed. "You knew all of it."
Somin straightened, still breathing hard, then reached into her pouch and shoved a protein bar into Mira's hand.
Mira stared at it like it had insulted her ancestry.
"Eat," Somin said.
"I'm fine."
"No, you're not. None of us are. Eat anyway."
That got Jaehyuk to look over.
Mira didn't argue. She peeled the wrapper with the same expression she used for disarming traps and took one bite. Then a second.
Somin nodded like she'd won a war. "See? Human behavior. Incredible."
Mira chewed, jaw tight. "This is awful."
"Thank you," Somin said. "I made it with love and bad decisions."
Jaehyuk laughed once under his breath before he could stop himself.
Mira looked at him.
It wasn't a warm look. It was sharper than that. Measuring. Remembering.
The reward chamber doors had already begun to open.
Stone folded back. Light spilled through the gap.
Mira took another bite of the bar, then wiped her mouth with the back of her hand.
"I'll stay," she said.
Jaehyuk looked at her. "You said one floor."
"I changed my mind."
Somin brightened. "Oh! Great. I'm very into this development. We can get matching team names and everything. Or not matching. We can be cool about it."
Mira didn't even glance at her.
Her eyes stayed on Jaehyuk.
"One condition," she said.
The room went quiet again.
Not the same quiet as before. Thicker. Heavier.
Jaehyuk's thumb tapped once against his finger.
Mira stepped closer, just enough that he could smell the faint oil on her blade and the iron on her gloves.
"If you lie to me," she said, "I leave. And I don't come back."
Somin stopped smiling.
Jaehyuk didn't move.
Mira kept looking at him like she already knew the answer was somewhere behind his eyes.
Then the reward chamber door opened all the way.
And from inside, a voice said, very calmly, "Yun Jaehyuk. We need to talk about what you're carrying."