The wall closes behind us before I get a last look at what's left of the security office.
Three days. I know it before I even open my eyes this time, the same way I know which side of the bed I fell asleep on before I check.
I'm sitting up in my own room, lights off, curtains open on a Seoul that hasn't moved an inch since I last saw it. My phone says 4:12 in the morning. My hands say nothing at all, which after tonight almost counts as a mercy.
I don't check the news first this time. I check my own wrist instead, turning it under the streetlight coming through the window, looking for the mark that's supposed to prove any of it happened.
It's there. Thin, silver, easy to miss unless you already know to look for it. Easier every time to explain away as nothing, which is exactly the problem.
I get up. I wash my face. I make coffee I don't actually want, mostly because doing something with my hands is still the only trick I know for getting through the first hour back.
Mom's awake by six, the way she always is now, like some part of her stopped fully sleeping the night of the Hongdae attack and never started again.
"You're up early," she says, and there's a whole sentence hiding behind how carefully she says it. Are you all right. Did it happen again. Should I be worried this time.
"Couldn't sleep." True enough. I've stopped keeping precise track of which of my sentences are lies and which are just incomplete.
She studies me a second longer than she needs to, then decides whatever she sees is close enough to fine, and lets it go.
That's the part Jung-su warned me about, back after the second cycle, in a lobby full of faces I already half-recognized from the room before. You'll get better at it, he'd said. I promise you won't like getting better at it.
He was right on both counts. I've gotten good at this. Good enough that my own mother doesn't ask a second question anymore, and some nights that scares me more than anything in the trials themselves.
I don't call my friend this time. I already know how that conversation goes, and I don't have anything left over to spend confirming it a second time.
I check the names instead, close to midnight on the second night. Soo-ah. Min-jun. Dae-sung. Still nothing, all three of them, the same clean empty search results I've already memorized the shape of.
Then, because I've never actually tried it before, I search for the thing itself instead of the people it took.
Missing hours. Woke up somewhere else. Nobody believes me.
Most of what comes back is nothing — insomnia forums, ghost stories, a subreddit about sleep paralysis. Three pages down, buried under all of it, there's a thread with forty replies that reads different from the rest. People describing gaps they can't account for. A mark on the wrist, mentioned almost in passing, like even the people posting it don't expect anyone to believe that part either.
Nobody in the thread is talking to anybody else, not really. Dozens of people typing into the same silence, each one convinced they're the only one standing in it.
I don't post anything. I don't know what I'd even say that wouldn't just be one more voice nobody trusts. But I leave the thread open longer than I mean to, and for the first time since this started, the loneliness has a shape that isn't only mine.
On the third night I take the folded paper out of my wallet, the one with two names written on it in my own handwriting, and I almost add a third before I stop myself.
Nobody new is gone yet. Not from the people I actually know. I fold it back up and put it away before I can start treating that as a countdown instead of the small, stupid mercy it still is.
I fall asleep before the third day's up. It finds me anyway, the same way it always does — light, total, painless, and then nothing at all until it isn't nothing anymore.
* * *
The first thing I notice is wind.
Real wind, cold enough to sting, carrying something that smells almost right — pine, cold metal, the ghost of grilled corn from a cart that isn't actually here. I'm standing on an observation deck with a low stone railing, the city spread out below in a smear of light that runs on longer than Seoul actually does from anywhere I've stood in it before.
N Seoul Tower rises behind me, lit gold against a sky too clean to be real. A cable car dangles from its line above the tree line, swaying gently, empty.
Fences everywhere. Every inch of railing in sight is buried under padlocks, thousands of them, layered three and four deep, ribbons and marker-pen names fused together under a rust that shouldn't have had years to happen.
It's beautiful. That's what gets me first, worse than any of the wrongness underneath it — how genuinely beautiful this room decided to be tonight.
I check the floor before I let myself believe any of it. Warm, faintly, under the stone tile, the exact wrongness I've learned to feel for without needing to think about it anymore.
There. Fourth room, and I found it before anyone said a word to me about it.
The lights overhead don't reach the underside of the cable-car line. Real floodlights would. Beneath the wind, a faint pulse beats through the deck.
"You feel that fast now," Jung-su says, appearing at my shoulder like he's been there the whole time. Maybe he has. "Floor first. Before you even look around."
"Is that good or bad."
"Yes," he says, which isn't an answer, and somehow is anyway.
Yohan finds us next, hands jammed in his pockets against the cold, staring up at the tower like a tourist who forgot he isn't one. "Okay. I want it on record that if this is the one that finally gets me, I at least got a nice view first."
"Don't say that," Areum says, arriving a half-step behind him, still favoring the arm that hasn't finished healing right. "You don't get to joke about that yet. Ask me again after the first person screams."
"Give it ten minutes," Jung-su says.
Nobody argues the estimate.
Mrs. Bae is already sweeping the crowd with the same eye she's used every time, counting kids the way other people count exits. There are more of them this round — a whole school trip's worth, uniforms still on, one girl clutching a stuffed animal like it's the only piece of her actual life she managed to bring with her.
"Third time's the charm," Mrs. Bae mutters, not really to any of us, and starts herding.
* * *
The crowd on this deck is bigger than the last two rooms combined, which means more strangers, which means more faces I don't have names for and don't know if I'll get the chance to.
A girl near the ticket booth is crying, openly, no shame left to spend on hiding it. A boy beside her — Korean, college-age maybe — has both arms around her, saying something too quiet to carry over the wind.
Near the vending machines, someone's counting. Out loud, under her breath, fast — padlocks, maybe, or people, or something else entirely, marking a running total against a number only she seems to know. Halfway through, she stops, frowns, and starts the same section over from the beginning, like the number she landed on the first time didn't match something she already knew to expect. She doesn't look up when I pass. Doesn't stop counting either.
A wiry guy in a courier's windbreaker is already moving through the crowd like he's mapping it, checking sightlines, testing which gaps between bodies would actually let a person move if it came to that. He clocks me clocking him and grins, quick, easy.
"You've done this before," he says, not quite a question, already moving past me before I can answer it.
"Once or twice."
"Cool. Tell me the trick later, if there is one." He's gone before I can decide if he means it.
Near the base of the tower, a cluster of maybe a dozen people has formed a loose half-circle around one guy doing the talking. Not loud about it. Steady, instead, the kind of voice that doesn't need volume to hold a room.
I catch his number before I catch his face properly. Higher than it has any business being for someone who's supposedly as new to this as everyone else on this deck. Whatever he did to earn it, he did it somewhere I wasn't watching.
"You four, stay near the railing and call out anything that moves," he's saying, already pointing, already sorting strangers into a shape that has a job attached to it. "You two, you're watching the tower entrance. Anyone hurt comes to me first, not the crowd, understood?"
Nobody argues with him either. People keep drifting closer, pulled in by whoever sounds like they already know something, and twenty minutes into a night none of them chose, the group around him is already starting to look less like strangers and more like a unit.
"Somebody's already recruiting," Yohan says, following my eyes.
"Or organizing," I say. "Not the same thing."
"Feels the same from here."
Past the vending machines, a tall man mutters something under his breath in a language I don't recognize, glaring at a phone with no signal like it personally betrayed him. I've seen him before, I think — half a glimpse in a different crowd, two rooms back, a face that shouldn't be familiar this fast and somehow already is.
He catches me looking and switches to English, fast and clipped, more to himself than to me. "Sixty-something people, one working exit so far, one cable car nobody's checked yet. Bad ratio." He says it like a man doing math he wishes had a better answer at the end of it, then goes back to glaring at his phone.
"Hi." A girl's voice, close, warm in a way that stands out against everything else on this deck. "You looked like you actually know what's happening. Which, given the alternative—"
She doesn't finish the sentence. Doesn't need to.
She's maybe our age, hair pulled back in a hurry, a jacket two sizes too big that isn't hers. Her eyes are red from crying earlier, dry now, replaced by something steadier.
"Yuna," she says, and offers a hand like this is a completely normal way to meet someone.
I clock her number without meaning to, the way all of us do it by now — a glance at her wrist, gold digits sitting low and small under everything else. One. Fresh. Lower than any of ours, which just means she hasn't had the chance yet to become whatever the rest of us are already becoming.
Yohan shakes it before I do. "Yohan. This is Hyunmin. Jung-su. Areum." He says Areum's name half a beat slower, like some part of him is still bracing for the recognition most people give her. Yuna's face doesn't change at all.
"Nice to meet you," she says, to all of us, and somehow it doesn't sound insane, given where we're standing. "Is it always this—" she gestures at the tower, the fences, the whole gold-lit wind of it, "—pretty? Before it stops being pretty?"
"First time we've gotten pretty," Jung-su says. "Don't get used to it."
"Noted." She falls into step beside Yohan without seeming to decide to. She's found the quiet thing to stand next to tonight, and doesn't seem to notice she's found it. "So what's the actual plan. Or is there one yet."
"Working on it," Yohan says, and something in his voice has already gone easier than it was thirty seconds ago.
Yohan's voice goes easier around her. Areum catches me noticing and raises one eyebrow.
Areum watches too, quieter about it, arms still crossed over the arm that hasn't healed right. She doesn't say anything to Yuna directly, not yet, but she doesn't look away from her either, the same careful once-over she gave the rest of us the night we met her, back before any of us had earned the benefit of the doubt.
"She's new," Areum says quietly. "Don't decide what that means before she gets a chance to."
"You trust her?"
"Ask me after she's had the chance to disappoint us."
* * *
The bracelet buzzes low against my wrist, the whole deck's worth of bracelets buzzing in the same half-second, a hundred quiet vibrations landing together like a held breath finally let go.
STAGE 4 — TIER C.
Higher than last time. Nobody says the word out loud, but I watch it land on face after face around the deck, a whole crowd doing the same math I already learned not to trust.
"Don't trust the tier," I tell Yuna. "The last low-tier stage nearly killed half the room. We still don't know what the labels measure."
"That's the worst possible system," she says.
"Yeah," Jung-su says. "It usually is."
No riddle follows. The condition appears instead.
STAGE 4 — THE KEEPER
CLEAR CONDITION: FREE EVERY LIVING CAPTIVE.
FAILURE CONDITION: ANY CAPTIVE CLAIMED BY THE KEEPER IS LOST.
The objective is rescue. The thousands of locks refuse to tell us which one matters.
A cable car door slides open on its own, twenty meters up the platform, with nobody standing anywhere near the mechanism.
Nobody screams. Not yet. It's too polite an invitation for that, too much like something a real tower might actually do on an ordinary night.
"That's new," Yohan says.
"Everything here is new," I say. "That's the part nobody warns you about."
* * *
We're maybe forty feet from the open car when the first padlock falls.
One, off the fence nearest the railing, hitting stone with a sound too heavy for its size. Then a second, a few feet down. Then a whole cluster at once, a wave running along the fence line like something underneath the metal just shifted its weight.
The girl with the stuffed animal screams. The woman gripping her hand yanks her backward, away from the railing, and that's when the fence itself starts to bow inward, chain-link buckling toward the crowd like it just remembered it isn't only decoration.
"Move," Jung-su says, already pulling Areum back by the arm.
I don't move fast enough. I know it the second the fence gives, a whole section swinging loose and low, straight at head height, straight at Yuna, who's turned the wrong way, still watching the cable car instead of the railing behind her.
I don't decide to do anything. My body's already moving before the thought finishes forming, the way it always has. Except this time it's different.
Not power. Balance.
My feet already know where the ground is uneven before I look down at it. My weight shifts before the swinging fence section even finishes its arc, like some part of me has run this exact motion a hundred times already and simply never mentioned it to the rest of me.
I get a hand on Yuna's shoulder and pull her sideways in one clean motion, no wasted half-step, no stumble, and the fence section whistles past close enough to stir her hair before it hits the stone where she was standing a full second ago.
Gold flickers at the edge of my vision, there and gone before I can read all of it. AGI, and a number after it, climbing, already fading by the time I try to focus on the digits.
She stares at the spot. Then at me.
"How did you—"
"I don't know," I say, and for once it's completely true.
I check my own wrist without deciding to, the way I've started doing every time something almost takes a piece out of me. Whole number, untouched, exactly where it was before the fence ever moved. Whatever almost happened to Yuna never got close enough to register on me at all.
Jung-su's watching me with an expression I haven't seen on him yet, something closer to recognition than surprise, like a theory he's been sitting on just proved itself right in front of him.
"AGI," he says. "Feels different from the other two, doesn't it. Less like getting stronger. More like remembering something you never actually learned."
I don't answer him. I'm still watching the fence line, still buckling, still shedding padlocks in slow uneven waves, and underneath the sound of metal hitting stone I can hear it now — the pulse from the floor, no longer patient, no longer content to just sit there waiting to be noticed.
It's speeding up.
"Everyone off the platform," I say, loud enough to carry, and for the first time since we landed on this deck, nobody argues with me at all.
Mrs. Bae is already moving, one kid under each arm, shouting names I don't know toward the rest of the school group. "Away from the railing," she calls, not panicked, just loud, the same voice she's probably used on classrooms for thirty years. "Toward the stairs. Now, not in a minute."
The counting girl by the vending machines finally looks up, whatever number she'd reached forgotten mid-count. Even the half-circle around the organizer breaks apart at once, twelve strangers suddenly moving in twelve different directions like the room just answered a question none of them had finished asking.
Jung-su's already scanning the treeline instead of the fence, jaw tight in the specific way I've learned means his Danger Sense is telling him something the rest of us haven't caught up to yet.
"It's not the fence," he says. "The fence is just what we're allowed to see first."
Above the treeline, the empty cable car stops swaying and goes dead still, though the wind hasn't dropped at all.
Then it drops half a meter and catches. Something on the roof shifts its weight toward the platform below.
Nobody else has looked up yet. I don't tell them to. Not until I have to.
I don't know what's under this floor, or how bad tonight is actually going to get before it lets any of us leave.
I know the fence is still falling, and the car on the line is still settling its weight, and I know, for the first time since I started keeping score, that some part of me got somewhere before I did.