Mousetrap

What to expect, before you press play.

CompletedIDENTITY THEFT THRILLER PICK

Mousetrap

들쥐 (Deuljwi) · 2026 · South Korea

WriterLee Jae-gon

DirectorKim Hong-seon

Episodes10 eps · ~50 min each

Where to Watch✅ Netflix

⏱️

Binge Time8h 20m

AiredAug 28, 2026

GenreThriller · Mystery · Crime

Content Rating18+

Netflix

Identity TheftLoan SharkWebtoon AdaptationReclusive WriterPsychological Suspense

Everything that matters, at a glance.

The man erased from his own life, and the loan shark who becomes his only way back to it.

Ryu Jun-yeol

Je Moon-jae

Lead

Sul Kyung-gu

No-ja

Lead

Kim Seung-oh

Seung-gyu

Supporting

Lee Kyoo-hyung

Sun-yong

Supporting

Hyun Bong-sik

Myung-su

Supporting

Moo Jin-sung

Son Su-hyun

Supporting

Enough per episode to jog your memory, nothing more.

EP 01

A Face That Isn’t His

Je Moon-jae has spent years routing his whole life through one friend, hiding from the world entirely. That friend vanishes the same day his fingerprint stops opening his own phone — and the reason shows up in person: a man wearing his exact face, saying flatly, ‘It’s me. You.’ Someone called The Rat has already taken his name, his assets, his identity. The only ally left is No-ja, the loan shark who’d been hunting him for debt long before any of this began.

EP 02

Two Investigations, One Target

No-ja doesn’t waste time being embarrassed that Moon-jae slipped his grip — he uses the chase to dig into how identity laundering like this actually works. Somewhere else in the city, Detective Park Sun-yong, a demoted cop with nothing left to lose, starts connecting threads between No-ja and the man now walking around wearing Moon-jae’s face. Two investigations closing in on the same target rarely stay separate for long.

EP 03

Client, Hostage, Bait

No-ja settles into an odd dual role — Moon-jae is paying client and de facto hostage at the same time, which suits a man who trusts no one anyway. Curiosity wins out over suspicion just enough for No-ja to actually listen to what Moon-jae’s proposing: use the identity thief’s own greed against him. What starts as a shaky partnership of convenience turns into the first real move of the season, a trap built specifically to draw The Rat out into the open.

EP 04

The Island in His Memory

A recovered memory changes everything for Moon-jae — The Rat isn’t a stranger who happened to pick him, it’s someone from his own past he’d buried along with everything else about himself. He and No-ja follow that memory to an island the man once called home, chasing whatever’s left of a life that might finally explain why Moon-jae specifically was the one targeted. The trail is getting personal in a way neither of them expected this early.

EP 05

No Strangers After All

The investigation takes a turn nobody saw coming — No-ja and The Rat, it turns out, aren’t strangers to each other after all, and that history complicates who’s actually using who in this alliance. Sun-yong, meanwhile, finally gets his hands on evidence solid enough to move the case forward for real. Then The Rat does something reckless: he shows his face in public, cornering Moon-jae directly, as if daring anyone watching to try and stop him.

EP 06

Nobody Left to Vouch for Him

Running out of allies who’ll vouch for the version of him that isn’t a stranger wearing his face, Moon-jae turns to the one connection left: his longtime editor, the person who might remember who he actually was before any of this. It doesn’t go the way he hoped — confusion and doubt take over fast when your own history stops being provable. In the middle of that spiral, a single text from No-ja is the only thing keeping him tethered to anything real.

EP 07

A Past That Ties Him In

Whatever Moon-jae barely escaped from in the last episode, it doesn’t slow him down — he’s already moving on the next lead, one person left who might be able to say plainly who he actually is. Sun-yong’s side of the investigation takes a darker turn: something in what he uncovers about his own past ties him to this case in a way he clearly didn’t see coming. Two men chasing the same mystery for very different reasons, and the reasons just got a lot more personal.

EP 08

Buried by His Own Past

Moon-jae doesn’t get a break — whatever ground he gained last episode erodes fast as things keep sliding further out of his control. Sun-yong’s own lead evaporates at a nursing home, the one witness who might have confirmed his theory gone before he gets there. And No-ja, who’s spent this whole season keeping his own history carefully out of frame, finally can’t outrun it — his past catches up in a way that looks less like a setback and more like a wall.

EP 09

Where It All Began

With the finale one episode away, Moon-jae slips past the police watching him and goes back to wherever this nightmare actually started, to face The Rat directly instead of running. No-ja sends him off with something that sounds less like strategy and more like advice for someone he doesn’t expect to see again. Sun-yong, meanwhile, is still one witness short of the proof that ties everything together — and running out of episodes to find them.

EP 10

No More Doors Left

Every thread the season pulled together — the theft, the doppelganger, No-ja’s buried history, Sun-yong’s case — collapses into one confrontation built to break Moon-jae for good. The finale forces the question the whole season has circled without answering: has he actually been the one being hunted, or has he become exactly what took everything from him? Ten episodes of running end in a room with no more doors left.

Full spoilers — breaking down the finale and what it means.

What actually happened Moon-jae was never the victim this season built him up to be. His real name is Park Chan-u, and since he was young he’d been quietly erasing his own older brother, Detective Sun-yong, from the family he was actually born into so he could take the Je Moon-jae name and life for himself. The Rat, it turns out, is Yu Min — the man whose identity, work, and years Chan-u stole next, resurfacing to take back what was actually his. Their last confrontation happens on a ship bound for Jeju, where Yu Min means to disappear and let the world find out exactly who Moon-jae really is.

Sun-yong gets there first, in a way — he pieces together that his brother’s entire account of the case has been staged from the start, that Moon-jae has spent his whole life taking other people’s places. But knowing and proving aren’t the same thing, and a detective with no body, no physical evidence, and no witness left to contradict a self-defense story has nothing to actually charge him with. The investigation Sun-yong ran all season doesn’t end in an arrest. It ends in a brother who has to live with what he can’t prove.

The fight on the ship The struggle between Moon-jae and Yu Min goes exactly the way a man with everything to lose fights: not clean, not heroic. Yu Min goes overboard and into the sea, and he doesn’t come back up. No body ever surfaces, which is precisely the outcome Moon-jae needs — there is no corpse to autopsy, no forensic trail back to a murder, nothing to hold him to except a story he gets to tell himself. He claims self-defense, and there’s no one left alive to say otherwise.

No-ja doesn’t walk away clean either. His own violent collision with Seung-gyu costs him the use of his right arm — a permanent price for a season spent chasing a debt that turned into something far more dangerous than money. It’s a fittingly unglamorous ending for a loan shark who was never going to get a triumphant one: he helped Moon-jae reclaim a name, and it cost him a hand.

The KDW verdict Moon-jae gets everything he legally wanted — his name back, his home back, no charge on his record — and the show is unambiguous that it isn’t a victory. He ends the season isolated, unable to write, alone in an apartment that’s stopped being a home and become the thing the title always promised: a trap, both literal and psychological, that he built for someone else and ended up locking himself inside. Mousetrap spends ten episodes asking who the real predator is, and the answer it lands on is the one that costs the most to sit with — it was Moon-jae all along, and reclaiming his stolen life meant becoming exactly the kind of person who steals one.