Mousetrap (2026) K-Drama Introduction
What if one morning you woke up and discovered that the world no longer believed you were you?
That unsettling question sits at the heart of Mousetrap, a 2026 Korean mystery thriller starring Ryu Jun-yeol, Sul Kyung-gu and Lee Kyoo-hyung. The Netflix limited series takes the familiar idea of stolen identity and gives it a darker Korean folklore-inspired twist.
Based on the Kakao webtoon Field Mouse by Ludvico, the series follows reclusive novelist Je Moon-jae after his identity, money, and apparently even his place in society begin slipping away. His desperate search for the person known as “The Rat” eventually brings him together with No-ja, a ruthless loan shark who has his own reason for chasing him.
The Mousetrap K-drama review comes down to one major question: can its fascinating mystery sustain the tension across a 10-episode story?
IMDb Rating: 7.6/10
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Story and Plot
Je Moon-jae is a successful but extremely private novelist who has withdrawn from ordinary society. His carefully controlled life suddenly collapses when he discovers that basic things connected to his identity are no longer working as they should.
His money is inaccessible. His personal information appears to belong to somebody else. Even his attempts to prove that he is the real Moon-jae become increasingly difficult.
The situation becomes even more frightening when another man appears to be living a life that should belong to him.
Moon-jae eventually crosses paths with No-ja, a dangerous loan shark who initially has his own reasons for pursuing the novelist. Their relationship is hardly friendly, but circumstances force them into an uneasy alliance as they begin searching for the mysterious figure called “The Rat.”
The series also draws from a Korean folktale in which a rat can transform into a person after consuming that person's discarded fingernails or toenails. Rather than simply reproducing the old tale, Mousetrap reimagines the idea within a modern mystery involving identity, deception and paranoia.
The result is a story where the biggest mystery is not simply who stole Moon-jae's identity, but whether the characters can trust what they believe to be real.
Cast and Characters
Ryu Jun-yeol as Je Moon-jae
Ryu Jun-yeol leads the series as Moon-jae, a reclusive novelist whose entire existence begins to unravel.
The role requires him to portray a character dealing with fear, confusion and paranoia while gradually being pushed out of the isolated life he has built for himself. Ryu has also spoken about the challenge of making the character's dual aspects convincing, particularly through differences in personality and voice.
His restrained performance is an important part of the show's atmosphere.
Sul Kyung-gu as No-ja
Sul Kyung-gu plays No-ja, a ruthless loan shark driven by money and his own objectives.
He is almost the opposite of Moon-jae. Where Moon-jae is isolated and anxious, No-ja is more physically forceful and accustomed to operating in dangerous environments.
Their unlikely partnership gives the series some of its most interesting character dynamics.
Lee Kyoo-hyung as Detective Sun-yong
Lee Kyoo-hyung plays Detective Sun-yong, who becomes involved in the investigation surrounding “The Rat.”
His character adds another perspective to the mystery because the audience is not simply following Moon-jae and No-ja; there is also an official investigation attempting to understand what is happening.
Supporting Cast
The series also features actors including Kim Sung-oh, Moo Jin-sung and Hyeon Bong-sik in supporting roles.
Rather than relying entirely on a huge ensemble, Mousetrap keeps its central mystery focused around the three major players: Moon-jae, No-ja and Sun-yong.
Performance and Acting
The strongest element of the series is arguably its lead cast.
Ryu Jun-yeol gives Moon-jae an appropriately uneasy presence. His character is not a traditional action hero, and that works in the show's favour. Much of the tension comes from watching an ordinary man struggle to establish something as basic as his own identity.
Sul Kyung-gu brings a completely different energy. His No-ja is intimidating and unpredictable, creating a useful contrast with Moon-jae.
The chemistry between the two characters is particularly important because their alliance is built on necessity rather than trust.
Lee Kyoo-hyung adds another layer through the detective storyline, giving the mystery an investigative perspective alongside the more personal pursuit led by Moon-jae and No-ja.
Direction and Screenplay
Mousetrap is directed by Kim Hong-sun and written by Lee Jae-gon. The series is adapted from the Kakao webtoon Field Mouse.
Kim Hong-sun is already associated with genre-driven projects including Money Heist: Korea – Joint Economic Area, The Guest and Dear Hongrang, making the psychological and mystery-heavy atmosphere of Mousetrap a natural fit for his style.
The screenplay's biggest strength is the central mystery. The idea of losing your identity is frightening precisely because it attacks something people normally take for granted.
The weakness is pacing.
Early reviews have described the series as stylish and intriguing but somewhat slow-moving. The South China Morning Post, for example, praised its enigmatic qualities while describing it as sluggish.
That means viewers looking for a nonstop thriller may find the story deliberately paced, while fans of slow-burn mysteries may appreciate the gradual accumulation of clues.
Genre and Themes
Mousetrap combines several genres rather effectively:
- Mystery thriller
- Crime drama
- Psychological suspense
- Identity-theft thriller
- Korean folklore-inspired mystery
- Webtoon adaptation
Its major themes include identity, paranoia, deception, trust, isolation and the fear of losing control over one's own life.
The Korean folktale element also gives the series a distinctive flavour. The supernatural-sounding story is used as inspiration, while the modern narrative focuses heavily on human behaviour and the question of what is real.
Music, Cinematography and Visual Style
The visual presentation is one of the show's notable strengths.
Mousetrap uses dark environments, controlled lighting and an uneasy atmosphere to keep the viewer uncomfortable even when nothing overtly frightening is happening.
The series often feels closer to a psychological crime thriller than a conventional romantic K-drama. That darker visual identity matches its themes of paranoia and stolen identity.
Early viewer reactions have also highlighted the lighting and cinematography as effective in creating an atmosphere that can feel almost horror-like at times.
Mousetrap (2026) K-Drama Details
| Detail | Information |
|---|---|
| Title | Mousetrap |
| Original Title | 들쥐 (Deuljwi) |
| Release Year | 2026 |
| Release Date | August 28, 2026 |
| Language | Korean |
| Country | South Korea |
| Genre | Mystery, Crime, Drama, Thriller |
| Director | Kim Hong-sun |
| Writer | Lee Jae-gon |
| Based On | Kakao webtoon Field Mouse by Ludvico |
| Main Cast | Ryu Jun-yeol, Sul Kyung-gu, Lee Kyoo-hyung |
| Episodes | 10 |
| Episode Runtime | Approximately 49–64 minutes |
| Platform | Netflix |
| Format | Limited Series |
| Certification | Netflix lists U/A 16+ in India |
The series premiered worldwide on August 28, 2026, and Netflix identifies it as a Korean thriller and limited series. Episode runtimes vary, with official classification information listing episodes at roughly 49 to 64 minutes.
Trailer Review
The trailer immediately establishes Moon-jae's unusual situation.
Instead of presenting him as a powerful protagonist, it places him in a frightening position where he has to convince other people that he is actually himself.
The mystery surrounding “The Rat” is deliberately kept at the centre of the promotional material. The trailer also introduces No-ja and suggests that the two men, despite being completely different, will have to work together.
The tone is dark, tense and psychological rather than romantic or comedic. The question running underneath the trailer is simple but effective:
If everyone thinks you are an impostor, how do you prove who you really are?
Netflix released both a teaser and a full trailer ahead of the August 28 premiere.
Mousetrap Netflix Release Date and Streaming Details
Mousetrap premiered on Netflix on August 28, 2026.
It is a Netflix original limited series with 10 episodes, and Netflix currently lists the show in its catalogue. The official Netflix page categorises it as a Korean mystery/crime/thriller series based on a webtoon.
For Indian viewers, Netflix currently lists the series with Korean original audio and multiple subtitle options, while the exact audio/subtitle availability can vary by region.
What Works in Mousetrap?
1. The identity-theft premise
The central idea is immediately intriguing. Losing access to your own name, money and identity creates a very personal kind of suspense.
2. Ryu Jun-yeol's performance
Moon-jae requires vulnerability rather than conventional heroism, and Ryu Jun-yeol's performance fits that psychological direction.
3. The unusual partnership
Putting a frightened novelist and a ruthless loan shark together is an effective storytelling choice. Their personalities are almost complete opposites.
4. Korean folklore connection
The field-mouse folklore gives the series a distinctive foundation instead of making it feel like another generic identity-theft thriller.
5. Atmosphere
The dark lighting, mystery-driven presentation and uneasy tone create an environment where even ordinary scenes can feel suspicious.
What May Not Work?
1. Slow pacing
The biggest concern is pacing. The series takes its time establishing Moon-jae's situation and gradually opening up the larger mystery.
2. Requires attention
This is not the type of thriller that works well as background television. There are identities, clues and character connections to keep track of.
3. Mystery over immediate action
Viewers expecting constant action may be disappointed. The series puts more emphasis on psychological tension and investigation.
4. Some viewers may find the ambiguity frustrating
Because the story intentionally keeps certain questions open for a while, viewers who prefer immediate explanations may need patience.
These concerns are consistent with early critical responses describing the show as visually polished and intriguing while also noting its slower pace.
Who Should Watch Mousetrap?
Mousetrap is a strong choice for viewers who enjoy:
- Korean mystery thrillers
- Psychological crime dramas
- Identity-theft stories
- Dark webtoon adaptations
- Slow-burn suspense
- Unusual detective mysteries
- Korean folklore-inspired stories
If your favourite K-dramas are primarily romance-focused, this is a very different experience. But if you enjoyed darker Netflix thrillers and mysteries, Mousetrap deserves a place on your watchlist.
Mousetrap 2026 Final Review and Verdict
Mousetrap arrives with one of the more unusual thriller concepts of the 2026 K-drama lineup.
Its biggest achievement is making something as ordinary as personal identity feel frightening. Moon-jae isn't simply trying to discover who stole his money or property; he is fighting to prove that his entire existence belongs to him.
Ryu Jun-yeol and Sul Kyung-gu form an effective central pairing, while Lee Kyoo-hyung's detective character adds another route into the mystery.
The series is not perfect. Its slow-burn approach will not suit everyone, and the mystery sometimes takes longer than expected to develop. However, the atmosphere, performances and unusual premise give it enough personality to stand apart from more conventional Korean thrillers.
For viewers who enjoy dark mysteries, identity conspiracies and psychological suspense, Mousetrap is worth watching.
Overall Rating: 3.5/5 ⭐
This is an editorial rating based on the series' premise, performances, direction, atmosphere, pacing and available critical response. It is not an official Netflix rating.
Frequently Asked Questions About Mousetrap K-Drama
What is Mousetrap K-drama about?
Mousetrap follows reclusive novelist Je Moon-jae after his identity is stolen. He loses control of his money and personal life and eventually teams up with loan shark No-ja to search for the mysterious person known as “The Rat.”
Who are the main actors in Mousetrap?
The main cast includes Ryu Jun-yeol as Moon-jae, Sul Kyung-gu as No-ja and Lee Kyoo-hyung as detective Sun-yong.
Who directed Mousetrap?
Mousetrap was directed by Kim Hong-sun, who is known for genre projects including Money Heist: Korea – Joint Economic Area and The Guest.
Who wrote Mousetrap?
The series was written by Lee Jae-gon and adapted from the Kakao webtoon Field Mouse by Ludvico.
When did Mousetrap release?
Mousetrap premiered worldwide on August 28, 2026.
How many episodes are in Mousetrap?
Mousetrap is a 10-episode limited series.
Where can I watch Mousetrap?
Mousetrap is available to stream on Netflix. The official Netflix listing identifies it as a 2026 Korean thriller and limited series.
Is Mousetrap based on a webtoon?
Yes. The series is based on the Kakao webtoon Field Mouse, created by Ludvico.
Is Mousetrap a horror K-drama?
Mousetrap is officially categorised primarily as a thriller, mystery and crime series, rather than a conventional horror drama. However, its folklore-inspired premise and unsettling atmosphere can give some scenes a horror-like feeling.
Is Mousetrap worth watching?
Yes, especially if you enjoy psychological mystery thrillers, identity-theft stories and dark Korean dramas. Its slower pace may require patience, but the central mystery and lead performances make it an interesting watch.
What is the Mousetrap K-drama rating?
My editorial rating for Mousetrap is 3.5/5 ⭐. This is a personal review score, not an official Netflix or IMDb rating.