The first punch came out of nowhere.
Jaehyuk twisted his shoulder and took it on the ribs instead of the jaw. Pain flared hot and sharp through his side, and the smell of iron hit the back of his throat.
His boots skidded on damp stone.
"Still slow," Iteration 6 said.
Jaehyuk looked up through the sting in his eyes.
The other man stood three steps away, coat hanging open, one hand still loose from the strike. Young face. Calm eyes. The same finger tap against his thumb.
The grey coat was gone.
Vanguard black sat on his shoulders now.
Not a scout's uniform. Not a field clerk's. A full inner-guild vest with the silver seam line on the collar.
Mira drew her sword halfway out. "You know him."
Somin was already moving toward Jaehyuk, palms glowing faint blue. "Don't talk, just hold still."
"I'm fine."
"You are not fine."
"I said hold still," she snapped, then slapped a heal over his ribs with enough force to make him hiss.
Warmth spread under the skin. The pain dulled from knife to fire.
Iteration 6 watched them work like this was all part of his schedule.
Jaehyuk pushed off the wall and straightened. He kept his voice flat.
"You picked a bad place."
"Did I?"
The corridor behind them was narrow and empty. One of Floor 29's maintenance arteries, sealed off from the main trial hall by a collapsed gate. Broken pipes dripped mineral water into shallow grooves in the stone. The air smelled wet, metallic, and old.
Interesting choice of word for a place where the Tower had already started listening.
Mira slid in front of Somin without looking away from the man. "Who is he?"
"Someone who likes hitting first," Jaehyuk said.
Iteration 6 smiled.
"That's not the answer."
"It's the one you earned."
He tapped his thumb once against his index finger. The sound was tiny, but in the corridor it landed like a coin dropped on tile.
Somin noticed. Her gaze flicked from his hand to Jaehyuk's.
Same habit.
Same shape.
Her mouth tightened.
"You two are making me very uncomfortable," she said.
"Good," Iteration 6 said. "Comfort gets people killed."
Mira's blade came fully free with a whisper of steel. The sound echoed off the wet walls.
"Who are you?" she said.
"Someone Vanguard found useful."
"That's not a name."
"No."
Jaehyuk said, "It never was."
Iteration 6's gaze shifted back to him.
For a second, the corridor went quiet enough that Jaehyuk could hear water dripping somewhere deeper in the wall and the faint hum of the Tower's floor core beneath the stone.
Then the other man said, "You took longer than I expected."
Jaehyuk's fingers tapped once against his thumb.
"You were expecting me?"
"I expected the shape of you. Not the details."
Mira frowned. "Both of you need to stop talking like that."
Somin's hand stayed on Jaehyuk's ribs, not because he needed it now, but because she wasn't letting go until she decided he was stable. Her eyes stayed on the stranger.
"He hit you first," she said.
"Yes."
"Why?"
Iteration 6 glanced at her. "Because you were in the way."
Somin stared.
Then Jaehyuk felt her fingers tighten once on his sleeve.
Not fear.
Anger.
Good.
Mira noticed it too. "You have a problem," she said to the stranger.
"I have several."
"No," Mira said. "You have a sword problem."
Iteration 6's mouth twitched. Almost amusement.
"If I wanted to kill you, I'd have done it before you drew."
"You didn't," Jaehyuk said. "That means you need something."
"You always were quicker at the second step."
There it was.
A mistake. Tiny. Careless.
Not in the words. In the tone.
He knew Jaehyuk too well.
Somin felt the shift too. Her brows drew together. "Oh, no. No, no. I hate that."
Jaehyuk didn't move.
"You know me," he said.
Iteration 6 leaned one shoulder against the wall like they had all the time in the world.
"Yes."
Mira's sword point lifted a fraction. "Say your name."
The man looked at her like she was a useful nuisance.
"You can call me Six."
Somin blinked. "That is not better."
"It wasn't meant to be."
Jaehyuk studied him.
Iteration 6. The grey coat. The index finger tap. The way he'd turned up where he shouldn't have been, always one step ahead, always with enough knowledge to be irritating but never enough to explain himself.
This was the first real conversation.
No sidelines. No Broker masks. No silent watching from a crowd.
A direct line.
Jaehyuk said, "Why Vanguard?"
Six's eyes stayed on him.
"Because they had a door."
"To what?"
"Above."
Mira's expression hardened. Somin frowned like she'd missed a punchline and hated herself for it.
Jaehyuk didn't react. That was the problem with hearing one word and suddenly understanding too much.
Above.
Not wealth. Not rank. Not survival.
Above.
"You joined them on purpose," Jaehyuk said.
Six shrugged. "Of course."
Somin looked between them. "You're telling me this guy chose Vanguard?"
"Yes," Jaehyuk said.
"Why would anyone do that?"
Six answered before Jaehyuk could. "Because if you stay outside, they decide the floor for you. If you go inside, you get a hand on the machine."
Mira's jaw flexed. "So you're one of them."
"I'm inside them. That's not the same thing."
"It sounds the same."
"Then you're not listening."
The corridor seemed smaller now. Less like stone and more like a box someone had put around their words.
Jaehyuk kept his voice low. "You came here to warn me?"
Six's gaze sharpened.
"Warn you? No."
"Then what?"
"To make you late."
That landed wrong.
Somin straightened a little. "Late for what?"
Six ignored her again. His attention never left Jaehyuk.
"You think this is still about surviving floors," he said. "You think if you rescue the right people, hit the right routes, clear faster, it all adds up."
Jaehyuk said nothing.
"That was true once," Six went on. "Not anymore."
Mira's sword shifted. Her patience was running thin enough to hear.
"You want to stop talking in riddles or I start cutting you."
Six finally looked at her.
"Do it if you want. Vanguard will still reach above you."
Mira's eyes narrowed.
Somin let out a short, disbelieving laugh. "That's the most irritating sentence I've heard all week."
"Then you haven't been paying attention," Six said.
Jaehyuk rubbed his ribs once. The heal had taken. The bruising was already cooling.
Good. He didn't like being slowed while Six kept control of the room.
"Say what you came to say," Jaehyuk said.
For the first time, Six looked almost pleased.
"There it is."
"What is?"
"The old you."
Mira's gaze snapped to Jaehyuk. Somin's hand paused in the air.
Jaehyuk ignored both.
"Talk."
Six pushed off the wall and stood upright.
"Vanguard isn't just hoarding routes and buying climbers," he said. "You already know that much. They're building access. Administrative access. Floor access. Archive access. The kind that lets you move where the Tower doesn't want anyone moving."
"To what end?" Jaehyuk asked.
"To reach above Floor 150."
Mira's brows drew together. "Why 150?"
Six gave her a look that bordered on pity.
"Because that's where the doors stop pretending."
Somin glanced at Jaehyuk. "He means what?"
"I don't know yet," Jaehyuk said.
That was enough to make both women stare at him.
Six noticed the reaction and his mouth curved slightly.
"You don't know. Good. That means the Tower still has room to lie to you."
Jaehyuk's jaw tightened. "And you think Vanguard is the only group trying to go there."
"I didn't say only."
"You said it's the only one trying."
"Trying and saying it out loud are different things."
Mira stepped forward. "Explain yourself."
Six's eyes shifted to her sword, then back to her face.
"No."
That simple refusal made the air feel hot.
Somin said, "Wow. Rude."
Jaehyuk almost agreed.
Instead he asked, "Why tell me now?"
Six looked at him for a long moment.
The corridor water dripped. Somewhere farther down, stone groaned under Tower pressure. The smell of wet metal thickened until it almost coated the tongue.
Then Six said, "Because the floor above you is no longer the floor you think it is."
Jaehyuk stared.
"What does that mean?"
"It means the Tower noticed your rescue on Floor 23," Six said. "It means the archive under Floor 28 wasn't empty. It means the old routes are gone, the new ones are wrong, and by the time you reach Floor 30, your precious pattern knowledge will be worth less than a cracked shield."
Somin swallowed. "That sounds bad."
"It is bad," Six said. "For everyone."
Mira's eyes narrowed again. "Not for you?"
"For me too. Especially for me."
Jaehyuk stared at him.
That wasn't a lie. Or if it was, it was a strange one. Too neat to be entirely false. Too tired to be a performance.
He asked, "You came all this way to tell me the Tower's changing?"
"No."
"Then what?"
Six exhaled through his nose.
For the first time since he'd appeared, something rough crossed his face. Not fear. Not regret.
Impatience.
With time. With delay. With all of this.
"I came to tell you what Vanguard actually is now," he said.
No one spoke.
Six looked at Jaehyuk like a man choosing where to place a knife.
"It's the only group trying to reach above Floor 150 because it's the only group that already has a route to the ledger vaults, the sealed archives, and the command channels under Floor 40."
Jaehyuk felt the pieces shift into place.
Archive access.
Contract City.
The ledger on Floor 10.
The thing the Broker never said directly.
The Tower wasn't just a dungeon. It had records. Infrastructure. Channels.
An organism with a spine.
"You're saying Vanguard can move through places other climbers can't," Jaehyuk said.
"Yes."
"And you're inside it."
"Yes."
"By choice."
"Yes."
Mira's voice was sharp now. "Then you're a traitor."
Six glanced at her.
"To whom?"
She didn't answer.
Somin looked uncomfortable. Not confused anymore. Just stuck between too many ugly truths.
Jaehyuk studied Six's face. The calm. The measured breathing. The eyes that never wandered far. This wasn't a man bluffing. He was too controlled for bluffing.
That made him worse.
"Why tell me any of this?" Jaehyuk asked again.
Six's answer came instantly.
"Because you're going to need a door that isn't mine."
The words hung there.
Jaehyuk said nothing.
Mira opened her mouth, probably to demand clarity, but the corridor lights flickered once.
Then twice.
The wet stone under their feet gave a low, deep shudder that ran up Jaehyuk's bones.
Somin turned sharply toward the gate behind them. "What was that?"
Another tremor.
This one stronger.
Mira's sword came up in a flash. "Tower quake?"
"No," Jaehyuk said before he knew why.
The floor vibrations had a rhythm.
Not random. Not structural.
Timed.
Six's face changed for the first time. Not much. Just enough.
"Too early," he muttered.
Jaehyuk's stare locked on him. "What did you do?"
"I didn't do this."
The corridor wall behind Six gave a sharp metallic crack.
A seam of blue light split through the stone.
Not from the floor.
From the wall.
Somin stumbled back. "Jaehyuk?"
The light widened.
Mira grabbed her shoulder and pulled her behind her. "Get down."
Jaehyuk didn't move.
He was looking at the line of light, at the pattern inside it, at the shape it was taking.
A door.
Not a maintenance gate.
Not a trial gate.
Something sealed.
Something old.
Six went still.
Then, very quietly, he said, "That's not supposed to be open yet."
The seam widened with a sound like stone skin tearing.
Cold air rushed out, carrying the stink of dust, old ink, and something burnt.
And from inside the dark, a voice spoke.
"Iteration 7..."
Jaehyuk's blood turned to ice.
The voice came again, rough and distant, from beyond the blue-lit threshold.
"...you're finally here."
The corridor went silent.
Then the thing in the doorway stepped forward, and Jaehyuk saw the Tower seal burned into its chest.
Not Vanguard.
Not the Broker.
A registrar.
A living one.
Its mouth opened.
"The archive wants to speak with you."