A man wakes up, presses his thumb to his phone, and nothing happens. The fingerprint that has unlocked his life for years suddenly belongs to someone else. That single beat of everyday panic is the engine of Mousetrap, the Korean thriller that landed on Netflix worldwide today, and it is a far more unsettling opening than any chase scene could manage.
What Happened
Netflix released Mousetrap globally on August 28, 2026, dropping all ten episodes at once. The series follows Je Moon-jae, a reclusive novelist who discovers that his name, his face, his bank accounts and his entire documented existence have been claimed by a stranger known only as the Rat. There is no supernatural machinery here, no body-swap spell — just a bureaucratic erasure so thorough that Moon-jae cannot prove to anyone, including the police, that he is himself.
Ryu Jun-yeol plays Moon-jae, and the role asks something of him he has never attempted before: a genuine dual performance. He appears as both the hollowed-out original and the impostor wearing his life, and he has been open about how mechanical the craft of that separation had to be. Speaking to reporters ahead of the premiere, he said he leaned hardest on vocal register so audiences could tell the two apart instantly, with smaller adjustments to gaze and posture doing the rest. Moon-jae, as Ryu describes him, had already withdrawn from the world for three years before the theft — a man with social anxiety who had built a very small, very orderly life, which makes the demolition of it land harder.
He is not alone in the hunt. Sol Kyung-gu plays No-ja, a loan shark running a private detective agency on the side, who had been chasing Moon-jae for an unpaid debt long before the Rat appeared. When Moon-jae walks back into his orbit voluntarily after three years and asks for help, No-ja takes the case for the oldest reason in the genre: there is money at the end of it. Lee Kyu-hyung rounds out the trio as Sun-yong, the detective who has to decide which of two identical men is telling the truth.
Behind the camera is Kim Hong-sun, a director with a long specialty in Korean genre television — Voice in 2017, The Guest in 2018, and the Netflix period thriller Dear Hongrang in 2025. The script comes from Lee Jae-gon, who wrote A Model Family, and the source material is the webtoon Field Mouse by the artist Ludvico. At a press conference at Hotel Naru Seoul – MGallery in Seoul’s Mapo District on August 20, Kim explained the strangest ingredient in the mix: the show is built on the old Korean folktale in which a rat that eats a person’s discarded fingernails takes on that person’s shape and walks into their house to replace them.
Why It Matters
Netflix has spent the better part of a decade turning Korean webtoons into series, and the hit rate has been high enough that the pipeline now functions almost as a development department. What separates Mousetrap from the pack is that its source folktale is genuinely local while its central fear is not. A rat that eats fingernails to become you is a very Korean image. Losing access to your own accounts, your own records, your own proof of personhood is something a viewer in São Paulo or Stockholm understands without a footnote.
That translation problem — how to keep a story rooted without making it require homework — is the quiet skill that has kept Korean drama exports growing. The show does not stop to explain the folktale. It simply arranges the plot so that the folktale’s logic feels inevitable: a creature moves in, takes the shape, and the household adjusts because the alternative is admitting something impossible. Moon-jae’s friends and colleagues make exactly that calculation, and it is more devastating than any confrontation.
Kim’s involvement is its own signal. His previous work has consistently been built around procedural momentum rather than mood alone, and he has said the webtoon’s horror atmosphere was reshaped in adaptation into something closer to a chase. That structural choice matters for a ten-episode release. A slow psychological unravelling can stall around episode four; a pursuit has a built-in engine. The wager is that audiences who came for the identity-theft hook will stay for the manhunt.
Reaction
The August 20 press conference in Mapo gave the cast their first real chance to frame the show, and what came through was how much everyone involved seemed to enjoy the premise’s cruelty. Kim described reading the script and simply needing to know who the Rat was — an admission that doubles as a pitch. Ryu said he had remembered the fingernail folktale from childhood and went looking for the original webtoon on his own after the script raised more questions than it answered.
Sol Kyung-gu, who has spent recent years mostly in film, described No-ja as belonging to “the last generation of classic mobsters” — a mid-level boss who does not care who anyone is, buries whoever he is told to bury, takes his cut and moves on. It is a deliberately unsentimental read on a character who could easily have been written as a gruff mentor, and pairing that flatness against Ryu’s unravelling novelist is the show’s most interesting casting decision. Sol also noted what drew him in: there are no powers and no spirits here, only people who feel somehow incomplete.
Kim pointed to one line of dialogue as the thematic spine. “Life is like an island,” he quoted, adding that every character in the series drifts through it isolated. It is the kind of authorial hint that can feel heavy-handed on paper, but it maps neatly onto a protagonist whose social anxiety had already made him unreachable long before anyone stole anything from him.
What’s Next
All ten episodes are live now, which means the next few days will be the real verdict. Netflix’s weekly Top 10 charts will show whether a webtoon-derived Korean thriller can hold non-Korean audiences the way the platform’s bigger Korean hits have, and the binge format gives it a fair test: nobody has to wait a week to decide whether the mystery is worth continuing.
It arrives in a crowded stretch for Korean content on the service. Four Hands, Two Sonatas, a youth musical romance, follows on August 29, and The Scandal, a limited series with Son Ye-jin and Ji Chang-wook, is set for September 18. Three very different registers inside three weeks is a reasonable snapshot of how broad the Korean slate has become — thriller, romance, prestige drama, all commissioned on the assumption that a global audience will show up for each.
For viewers deciding whether to start, the thing worth watching for is Ryu’s vocal work. He has said it was the primary tool he used to separate the two versions of Moon-jae, which makes the first episode a kind of technical showcase: the moment the impostor speaks, the performance either holds or it does not. Everything the series wants to do afterward depends on that.
Closing Thoughts
There is something bracing about a 2026 streaming thriller reaching back to a folktale about fingernails. The old story was a warning about carelessness — clip your nails, dispose of them properly, or something will use the pieces of you that you left lying around. Updated for a world of biometric locks and cloud accounts, the warning barely needs adjusting.
What makes the premise land is not the theft itself but the aftermath: the friends who look at Moon-jae and see a stranger, the systems that accept the impostor’s credentials without hesitation, the slow realization that identity was never really his to hold. It was a consensus, and consensus can be bought. That is a darker idea than most thrillers are willing to sit with, and the fact that it arrives dressed as a chase makes it go down easier.
Whether Mousetrap earns its ten episodes is a question the weekend will answer. But the setup alone — a man with no way to prove he exists, a loan shark with no reason to care, and a folktale creature living comfortably in his apartment — is the kind of premise that makes you want to keep watching just to find out who the Rat turns out to be. Kim said that was the only reason he took the job. It is a decent enough reason to press play.
한글 요약
넷플릭스 시리즈 마우스트랩이 8월 28일 전 세계에 10부작 전편으로 공개됐습니다. 은둔 생활을 하던 소설가 제문재(류준열)가 어느 날 지문 인식이 풀리지 않는 것을 시작으로, 이름과 얼굴과 재산까지 ‘쥐’라 불리는 정체불명의 인물에게 통째로 빼앗겼다는 사실을 알게 되는 이야기입니다. 류준열은 데뷔 이후 처음으로 1인 2역에 도전했고, 두 인물을 구분하기 위해 목소리 톤을 가장 중요한 장치로 삼았다고 밝혔습니다.
설경구는 사채업자 겸 흥신소 운영자 노자 역을, 이규형은 형사 선용 역을 맡았습니다. 연출은 보이스, 손 the guest, 탄금을 만든 김홍선 감독이, 각본은 모범가족의 이재곤 작가가 맡았으며, 원작은 루드비코 작가의 웹툰 들쥐입니다. 김 감독은 8월 20일 서울 마포구 호텔 나루 서울 엠갤러리에서 열린 제작발표회에서, 이 작품이 ‘손톱을 먹은 쥐가 사람으로 둔갑한다’는 한국 전래동화에서 출발했다고 설명했습니다.
웹툰 원작의 공포 분위기를 추격극 구조로 바꿔낸 점이 이 작품의 승부처입니다. 손톱을 먹는 쥐라는 이미지는 지극히 한국적이지만, 계좌와 기록과 신원 증명을 한꺼번에 잃는다는 공포는 설명이 필요 없는 보편적 감각입니다. 김 감독이 작품 전체를 요약하는 대사로 꼽은 “인생은 섬과 같다”는 문장처럼, 등장인물들은 각자 고립된 채 표류합니다. 8월 29일 포핸즈, 9월 18일 스캔들로 이어지는 넷플릭스 한국 라인업 속에서 이 작품이 어떤 성적을 낼지가 다음 관전 포인트입니다.