The training chamber smelled like wet stone, old incense, and the faint regret of every bad decision Haruto had ever made. It was a forgotten Joseon-era cistern buried so deep under Seoul that even the rats had given up and unionized somewhere else. Glowing shaman runes pulsed along the curved walls like cheap club lights that had been possessed by angry spirits. Every few seconds one of them flickered and made a sad little bzzt sound, as if the magic itself was running on expired batteries.
Echo stood in the middle of the shallow water, arms crossed, looking like she'd already regretted every life choice that had led her to babysitting a half-Japanese, half-Korean time bomb with a sword. Her moonlight knife spun lazily between her fingers like a bored fidget toy.
"Again," she said, voice flat. "Stop the drop. Don't just pause it like a buffering YouTube video. Choose which second lives and which one gets yeeted into the void."
A single water droplet fell from the ceiling, glistening innocently.
Haruto gripped the black-flame wakizashi. The blade hummed against his palm like an overcaffeinated phone on vibrate. Violet cracks flared across his eyes. He reached out with the Fracture, trying to be all cool and precise.
The droplet froze mid-air.
Then it shot upward like it had been personally offended, smacked the ceiling, and exploded into a tiny shower that somehow got directly into Haruto's left eye.
"Son of a—" He blinked rapidly, swearing in a beautiful hybrid of Japanese and Korean that would have made his ancestors proud and his mother wash his mouth out with gochujang.
Echo snorted so hard she almost dropped her knife. "Smooth, half-moon. Real smooth. Ten out of ten. The river is currently laughing at you."
The Mirror Keeper, sitting cross-legged in the shallows like a tiny zen monk who had seen some shit, tilted her head. A soft, almost mischievous smile tugged at her lips—the first time Haruto had seen her expression change from "eternal void stare." She raised one small hand and the water around her rippled. Suddenly the droplet reformed, fell again, and this time gently bopped Haruto on the nose before freezing perfectly in place.
"Show-off," Haruto muttered, wiping his face. The scar on his collarbone throbbed in amusement, the black threads wiggling like they were trying not to laugh.
Echo wiped tears from the corner of her eye. "Okay, okay. Serious time. Try again, but maybe don't treat time like it owes you money."
Haruto exhaled, centered himself, and tried once more. This time the droplet stopped, hovered, then gently reversed course and rose back into the crack above like a well-behaved elevator. The river immediately took its toll—ten whole minutes of his future vanished in a quiet poof. He felt the loss like a sudden craving for ramyeon he would never get to eat.
"Better," Echo admitted, circling him. "But you're still leaking futures like a broken faucet in a horror movie. The Chronos can smell that crap from three subway stops away. They're probably writing fanfiction about how delicious your anomaly tastes right now."
Haruto lowered the blade, shoulders slumping. "This would be a lot easier if the river sent a customer service number. 'Hello, yes, I'd like to speak to a supervisor about these unfair time fees—'"
The Mirror Keeper made a soft sound that might have been a giggle. Echo actually laughed outright this time, a bright, surprised sound that echoed strangely off the runes.
"Careful," she warned, still grinning. "Keep making jokes like that and the Warden's going to show up just to file a noise complaint."
They kept going for what felt like hours but was probably only twenty minutes on the surface. Haruto learned to layer futures in short bursts—dodging left in one thread, striking right in another, then snapping them together into one clean motion. Each successful combination left him a little older behind the eyes, the familiar melancholy settling heavier, like Seoul's summer humidity but with more existential dread.
At one point he got cocky. He tried to rewind an entire training sequence to fix a sloppy swing. Instead he accidentally looped the last thirty seconds five times in a row.
Echo watched in growing horror as Haruto kept repeating the same dramatic sword flourish, muttering "not like that, damn it" every single loop while the droplet kept falling and bopping him on the nose like a particularly stubborn pigeon.
On the fourth loop Echo just sat down in the water, laughing so hard she was crying. "Oh my god, you're stuck. You're actually time-looping yourself like a bad isekai protagonist who keeps reloading the save file because he keeps dying to the tutorial boss."
"Shut up," Haruto groaned, finally breaking the loop by sheer force of embarrassed willpower. His face was burning. "This is why I never played multiplayer games. I always get stuck in the tutorial."
The Mirror Keeper was quietly losing it behind her hands, shoulders shaking with silent laughter. Even the shaman runes seemed to flicker in amusement, one of them flashing a quick little heart shape before going back to normal.
By the time they called a break, Haruto was drenched in sweat and stolen-time exhaustion. He sat on a dry patch of stone, blade across his knees, the black flame flickering like it was also catching its breath.
Echo tossed him a bottle of water that had definitely been stolen from some surface convenience store. "You're improving faster than I expected. Most new Awakened either cry, throw up, or try to negotiate with the river like it's a loan shark. You mostly just insult it in two languages."
"Three, if you count the swearing," Haruto said, taking a long drink. "I threw in some English for flavor when the droplet got me in the eye."
She smirked. "Noted. We'll add 'multilingual time profanity' to your skill list."
A low, distant howl echoed through the tunnels—Chronos, still hunting, still hungry. The sound killed the laughter instantly, reminding them that this wasn't just training. It was survival with extra steps and worse customer service.
Haruto stood, gripping the blade tighter. The black threads from his scar coiled down his arm, reinforcing his hold. "One more round. I want to try bending a full minute before we head to the shadow-binder ward."
Echo raised an eyebrow. "Ambitious. Stupid, but ambitious. I like it."
The Mirror Keeper nodded once, her violet eyes serious again. She raised both hands, and the water around the chamber formed a perfect training circle—dozens of droplets suspended in the air like tiny crystal mines.
Haruto stepped into the center. The blade ignited brighter. Violet fractures flared across his vision until the entire cistern became a storm of branching possibilities. He moved.
Time bent.
Droplets froze, reversed, shattered, reformed. He wove between them like a dancer who had accidentally joined a deadly ballet. One droplet nearly clipped his ear; he rewound it mid-flight and sent it smacking into another like billiard balls. Echo had to duck as a stray time-fragment whizzed past her head.
"Watch it!" she yelped, but she was grinning again. "If you take my ponytail off I'm charging you emotional damages."
Haruto laughed despite himself—a short, breathless sound that felt foreign in his chest. For the first time since the rain had first frozen, the weight on his shoulders felt just a little lighter. Not gone. Never gone. But shared, at least for this ridiculous, dangerous, strangely funny moment.
When he finally released the bend, the river took its payment—twenty full minutes this time. He felt them slip away: a boring homeroom period, a convenience store run for onigiri he would never eat, a quiet walk home where he might have actually talked to Ji-eun instead of just nodding awkwardly.
Worth it.
Echo clapped slowly, genuinely impressed. "Not bad, half-moon. Not bad at all. Tomorrow we hit the shadow-binder ward. Veil's going to make you pay through the nose for training, but at least she has better snacks than this place."
The Mirror Keeper stood, brushing imaginary dust from her hanbok. She looked at Haruto and spoke for the first time in hours, her voice soft but carrying the weight of every mirror she had ever shattered.
"You laughed," she said simply. "The river does not like when its debtors find joy. Be careful… but do not stop."
Haruto met her endless violet eyes and gave a tired, crooked smile—the kind that didn't quite reach full happiness but was trying its best.
"Got it. Laugh responsibly. Got any other life advice, or should I just keep insulting ancient cosmic forces in broken Korean?"
Echo snorted again as she sheathed her knife. "Come on, comedian. Let's get you topside before you accidentally loop us all into next week. I still need to eat real food that doesn't taste like existential regret."
As they made their way back through the twisting Underflow tunnels, the distant howls of hunters grew fainter but never fully disappeared. Haruto walked between Echo and the Mirror Keeper, black-flame blade resting easy at his side, violet cracks in his eyes glowing softly.
The melancholy was still there—deep, heavy, familiar. But now it had company: a spark of ridiculous, stubborn humor that refused to be completely crushed by the weight of timelines and debts.
Seoul's neon waited above them, indifferent and beautiful.
And for the first time, Haruto felt like he might actually be ready to break a few more rules—and maybe crack a few more jokes—before the red moon finally rose.
The river could bill him later.