Mousetrap Series Review and Ratings
Starring: Ryu Jun-yeol, Sul Kyung-gu
Creators: Kim Hong-sun, Lee Jae-gon
Streaming Platform: Netflix
Filmyhype.com Ratings: 3.5/5 (three and a half stars)
A reclusive writer taps his thumb against his phone, and the device doesn’t recognize him. He goes to the bank, and the account isn’t his anymore. He heads home, only to find his apartment has already been sold — with his own signature on the paperwork. Everywhere he turns, he gets the same answer, delivered with the flat calm of someone reading straight off a screen: “You authorized this yourself.” No chase scenes, no violence — that’s how Mousetrap opens. And that’s exactly when it gets its hooks in you.
Based on the 2017 Kakao Webtoon Field Mouse by Ludovico, the series follows Je Moon-jae (Ryu Jun-yeol, of Reply 1988), a novelist writing under a pseudonym who wakes up one day to find his entire identity has been stolen out from under him. Panicked and increasingly desperate, he has to figure out who — or what — a mysterious figure known only as “The Rat” actually is, and how he can get his life back. That’s just the starting point, though. Directed by Kim Hong-sun (Project Wolf Hunting) and written by Lee Jae-gon (A Model Family), the series twists through the streets of Seoul and back through time in ways that keep expanding the mystery well past its opening premise.
Mousetrap Series Review: The Story Plot
Identity theft is a legitimately unsettling thing to think about in the real world. Mousetrap takes it to an entirely different level.
Picture waking up to discover someone has stolen your identity so completely that your own fingerprint won’t unlock your phone or your bank account. Strangers are living in your apartment, having purchased it from someone posing as you. There’s no medical record, no ID, nothing left anywhere that proves you’re actually you — because all of it has quietly been reassigned to someone else.
That’s exactly the situation Moon-jae finds himself in — a popular, deliberately private author whose obsession with anonymity ends up backfiring on him in the most extreme way imaginable. After the tragic death of his parents, Moon-jae withdrew almost entirely from the world, his literary success allowing him to hole up for years inside a high-tech, luxurious apartment. Every day follows the same rhythm: the same suppressed panic attack, the same recurring nightmare, watching daily life unfold through floor-to-ceiling windows — mail carriers, food vendors, the ordinary rhythms of a world he’s stopped participating in. His only real connection to anyone outside those walls is his friend and accountant, Son Su-hyeon (Moo Jin-sung, from The Tyrant).
Then, in the span of a single day, all of it gets taken from him. His identity is hijacked completely. Old high school friends don’t recognize him. He has no ID anywhere in the world that confirms who he is. And for reasons that gradually come into focus, he ends up on the run from a loan shark named Kim Yeong-geun, better known as No-ja (Sul Kyung-gu, of Peppermint Candy), all while searching for the elusive figure known only as The Rat, who seems to hold every answer he needs.
The series follows Je Moon-jae, a successful mystery novelist who hasn’t left his house in years. He deals with severe anxiety, publishes under a pen name, and is so fixated on privacy that he’s registered everything he owns — property, bank accounts, his entire estate — under the name of a childhood friend, an accountant he trusts completely. In practice, Moon-jae barely exists on paper at all. And whatever doesn’t officially exist is remarkably easy to erase.
When his identity gets stolen by a mysterious figure, Moon-jae discovers the impostor hasn’t just taken his name — he’s taken his face too. Unable to prove to anyone that he is who he says he is, Moon-jae ends up in an unlikely partnership with No-ja, a dangerous loan shark to whom the fake Moon-jae now owes a significant debt.
It’s about as mismatched a pair as you could imagine: a terrified victim and a ruthless creditor, both chasing the same ghost. And trailing right behind both of them is a detective trying to figure out who’s actually telling the truth.
Mousetrap Series Review and Analysis
If you’ve ever felt that half-second jolt of panic when your phone doesn’t immediately recognize your fingerprint, Mousetrap is going to stretch that exact feeling out across an entire season.
What makes the show work so well is its understanding that stealing someone’s identity today doesn’t require stealing anything physical at all — it just requires stealing credentials. A face becomes a login. A thumbprint becomes a signature. And the moment that data slips out of your control, you lose the ability to prove the single most basic fact about yourself: that you actually are you.
That’s exactly why the show gets under your skin. There’s no monster chasing anyone here — just the calm, immovable bureaucracy of a system that’s already decided you’re the impostor. And that’s precisely what makes it so effective as a piece of horror: it’s suffocating rather than gory, a paranoid nightmare that keeps looping back on itself right alongside its protagonist.
Ever since a childhood accident back in 2011 — one that probably wasn’t actually an accident — Moon-jae has withdrawn almost entirely from the world, managing a panic disorder with medication and avoiding going outside whenever possible. Years later, he’s a successful novelist living in a luxury high-rise, sticking to a rigid daily routine that consists of running on his treadmill and watching the same plaza below repeat itself day after day. His only regular visitor is an old classmate turned accountant, who — for reasons the show doesn’t fully explain yet — holds all of Moon-jae’s bank accounts and property under his own name.
During one of the classmate’s visits, a bird cracks one of the apartment’s floor-to-ceiling windows, and around the same time, Moon-jae discovers he can no longer access his own bank account. Even after his classmate gets him a replacement phone, the account stays locked. That’s around when Detective Park Sun-yong (Lee Kyu-hyung) shows up, following an anonymous tip, looking for someone named Kim Yeong-geun.
From there, things escalate quickly. After some time spent alone in his darkened office — a room lined with books and newspaper clippings documenting his own reclusiveness — Moon-jae emerges to find his apartment has been sold out from under him, and his classmate has gone completely silent. That’s what finally forces him out of his building for the first time in three years, still in pajamas and slippers, as he starts piecing together that someone else has been impersonating him in multiple places. The full scope of the identity theft becomes undeniable when a ruthless loan shark named No-ja (Sul Kyung-gu) shows up wielding a baseball bat, convinced Moon-jae owes him money.
The title isn’t just for atmosphere. The series draws on an old Korean legend about a mouse that transforms into a person after eating their discarded fingernail clippings. And the show does something genuinely clever with that folklore: rather than leaning into a straightforward supernatural horror angle, it translates the legend directly into 21st-century terms.
The “mouse” stealing someone else’s face isn’t a magical creature anymore — it’s biometric data theft, digital fraud, a hijacked online identity. It’s no accident that fingernail clippings keep resurfacing as a visual motif throughout the show, including in the opening scene, which ties directly into how Moon-jae lost his parents.
That layer is what connects Mousetrap to a well-established lineage of Korean thrillers built around stolen identities and lives rewritten by someone else — the creeping paranoia of Forgotten, echoes of the cruelty found in Oldboy, and the recent run of Netflix’s webtoon-based thrillers like Bloodhounds and Sweet Home. What sets this one apart is that the thing actually being stolen feels far more current — and, because of that, considerably more unsettling.
Moon-jae’s search for answers is really just the entry point into a much larger web the series pulls together. Running parallel to his story is Detective Park Sun-yong (Lee Kyu-hyung, from All of Us Are Dead), a hardened investigator working a separate suspected murder case, who receives an anonymous tip that eventually links him directly to Moon-jae, No-ja, and Su-hyeon. Bodies keep turning up with no identification and no fingerprint matches, and Sun-yong is determined to crack the case wide open. Meanwhile, a trio of hitmen is quietly watching everything unfold from the sidelines. And behind all of it, The Rat stays perpetually one step ahead, tracking every move from the shadows.
Ryu Jun-yeol’s performance genuinely pushes him in two different directions here, effectively playing two sides of the same character. As Moon-jae, his mounting anxiety and sense of helplessness come through with real authenticity — strong visual effects and surreal production design reinforce his agoraphobia, turning his fraught relationship with public space into something you can practically feel alongside him. As the show jumps back and forth through time to build out different characters’ perspectives, there’s a growing sense that Moon-jae might actually already hold the answers he’s desperately searching for. Sul Kyung-gu, meanwhile, is a genuine standout as the blunt, no-nonsense loan shark, managing to find real moments of levity in an otherwise dark show.
If there’s a real weakness here, it’s the show’s treatment of its female characters, who are largely reduced to single-line appearances, with some never even appearing on screen at all. The notable exception is publishing house editor-in-chief Han Ji-hye (Lee El, of The Call), who doesn’t enter the story until roughly the halfway point.
Mousetrap Series Review: The Last Words
If the mystery is what pulls you in, the action is what’ll keep you there — alongside an almost aggressively propulsive techno score. With Moon-jae, No-ja, and Sun-yong all chasing down their own versions of the truth, the show delivers some genuinely impressive set pieces: high-speed chases along Seoul’s Han River, an overhead-filmed police pursuit through the suburbs that’s shot with real style, and a brutal hand-to-hand fight staged inside a makeshift operating theater. The show’s slick, illustrated opening credits pay direct homage to its webtoon origins, while the action itself pushes well beyond anything the source material could have shown on the page.
Spanning ten episodes, Mousetrap technically counts as a limited series — a notably tighter format than most Korean dramas, which often stretch past 20 episodes. Despite that shorter runtime, the show never feels rushed. Instead, it takes its time building a genuinely chilling picture of identity theft through carefully constructed mystery, high-energy action, and twists that consistently land.
