Netflix's new Korean thriller Mousetrap hooks mystery fans
Netflix's new Korean thriller Mousetrap is now streaming—a 10-episode limited series built around "identity laundering" that turns one novelist's entire life into a puzzle. Based on the 2017 Kakao Webtoon Field Mouse, it follows Je Moon-jae as a shadowy figure called The Rat steals who he is, forcing a high-stakes chase through Seoul's past and present.
If you have burned through every whodunit on your watchlist, this arrival matters because South Korean suspense keeps raising the bar for global audiences. Mousetrap lands at a moment when mystery fans want stories that feel fresh yet grounded, and this one delivers both through webtoon roots and a cast stacked with familiar faces from beloved K-drama history.
Key Takeaways
- Mousetrap is a 10-episode Netflix limited series directed by Kim Hong-sun and written by Lee Jae-gon, adapted from Ludovico's 2017 webtoon Field Mouse.
- The plot centers on novelist Je Moon-jae, whose identity is completely stolen by a cryptic antagonist known as The Rat.
- Multiple storylines converge through detective Park Sun-yong, loan shark No-ja, and a trio of hit men watching from the sidelines.
- The show blends mystery, action set pieces across Seoul, and a techno-heavy score while honoring its illustrated webtoon origins.
- Reply 1988 star Ryu Jun-yeol leads a cast that includes Sul Kyung-gu, Moo Jin-sung, and Lee Kyu-hyung.
What is Netflix's new Korean thriller Mousetrap about?
At its core, Mousetrap asks a nightmare question: what happens when someone steals not just your passwords, but your entire existence? Je Moon-jae, played by Ryu Jun-yeol, is a popular author who hides his real identity—a choice that backfires when his fingerprint no longer unlocks his phone, strangers occupy his apartment, and every record that proves he exists belongs to someone else.
Moon-jae lives as a recluse in a high-tech luxury apartment after his parents' tragic death. His daily routine is rigid, his panic attacks familiar, and his only steady connection to the outside world is accountant friend Son Su-hyeon, played by Moo Jin-sung. One day, that fragile world collapses. High school friends fail to recognize him, official ID vanishes, and he finds himself hunted by loan shark Kim Yeong-geun, known as No-ja, played by Sul Kyung-gu.
The Rat holds the answers Moon-jae desperately needs, but the series treats that hunt as a starting point rather than the whole story. Mashable describes the thriller as an unsettling, high-octane dive into identity fraud, one that twists through Seoul's streets and deep into characters' histories. For viewers tracking how Korean storytelling evolves from page to screen, that layered structure is part of what makes this release feel timely rather than disposable.
How does Mousetrap turn a 2017 webtoon into a streaming-era thriller?
The nostalgia angle here is not retro décor—it is format. Field Mouse debuted on Kakao Webtoon in 2017, when digital comics were already reshaping how Korean audiences consumed serialized fiction. Nearly a decade later, Mousetrap arrives on Netflix as a fully realized live-action thriller, complete with a slick illustrated opening credit sequence that nods to its illustrated source.
That then-and-now journey mirrors a wider shift in entertainment. Webtoons once lived on phone screens during commutes; now they routinely seed global streaming hits. Readers who remember scrolling through Field Mouse get to see how directors expand static panels into overhead chase sequences, surreal production design, and set pieces staged along the Han River. The adaptation does not rush its 10-episode run—unlike some Korean dramas that stretch past 20 episodes—so the mystery has room to breathe.
If you follow how old favorites resurface in new formats, our Nostalgia: Then & Now coverage tracks exactly these kinds of revivals. Mousetrap sits comfortably in that conversation: a property born in the mobile-comics boom, reborn for the binge-watch era.
Who stars in Mousetrap and why does the cast elevate it?
Ryu Jun-yeol anchors the series with a dual performance that Mashable highlights as a standout. As Moon-jae, he renders mounting anxiety and helplessness with raw authenticity. Special effects and surreal design amplify the character's agoraphobia, turning public space into something visually threatening. When the narrative jumps through time to reveal different perspectives, viewers begin to suspect Moon-jae may already possess clues he cannot yet read.
Sul Kyung-gu, known to many from Peppermint Candy, delivers another highlight as No-ja. The loan shark is hard-edged but not one-note; Sul finds moments of levity inside an otherwise dark story. Lee Kyu-hyung, familiar from All of Us Are Dead, plays detective Park Sun-yong, a hardened investigator pulled into the case by an anonymous tip. Bodies without identification keep surfacing—no fingerprints, no matches—and Sun-yong refuses to let the pattern slide.
Behind the camera, director Kim Hong-sun previously helmed Project Wolf Hunting, while writer Lee Jae-gon worked on A Model Family. That pedigree signals a team comfortable balancing procedural tension with character-driven dread. For fans who first noticed Ryu in Reply 1988, watching him carry a paranoid thriller marks another kind of nostalgia: seeing a comfort actor pushed into unfamiliar emotional territory.
Is Mousetrap worth watching if you love mystery and action?
Critical reception from early coverage suggests yes—especially if you want a mystery that does not treat action as an afterthought. Moon-jae, No-ja, and Sun-yong each pursue separate truths, and their paths generate high-speed chases, suburban police hunts filmed from above, and sustained suspense across interconnected storylines. A trio of hit men observes events from the margins, while The Rat stays ahead in the shadows.
The score deserves its own mention. Mashable notes an outlandish amount of thumping techno driving key sequences, giving the series a propulsive energy that separates it from slower-burn crime dramas. If you came for the puzzle, the production invites you to stay for the kinetic set pieces.
The series is not flawless. Mashable flags a lack of meaningful female characters, with women largely confined to one-line scenes, some remaining off-screen entirely. That limitation is worth noting for viewers who expect ensemble balance. Still, for a tightly plotted limited run, Mousetrap earns its recommendation as a next mystery obsession.
Where can you watch Mousetrap right now?
Mousetrap is streaming now on Netflix as a completed 10-episode limited series. No weekly wait applies—you can follow every twist from Moon-jae's first stolen fingerprint to the final confrontation with The Rat in one sitting or spaced across a weekend.
For plot details and casting context straight from early review coverage, see the full write-up at Mashable. Netflix's own catalog listing remains the definitive place to confirm regional availability and subtitle options.
Whether you discovered Korean thrillers through classic film noir influences or more recent global hits, Mousetrap offers a contemporary hook—digital identity erasure—that feels uncomfortably relevant. The show translates a 2017 webtoon anxiety into 2026 streaming language, and that is precisely why Netflix's new Korean thriller is commanding attention now.