Mousetrap Netflix Webtoon Adaptation: Premiere Date, Cast

TL;DR: Mousetrap Netflix webtoon adaptation premieres August 28, 2026, all 10 episodes at once. It's based on Field Mouse, a completed 2017-2020 Kakao Webtoon horror-thriller by Ludovico. Ryu Jun-yeol and Sul Kyung-gu star as first-time co-leads, directed by Kim Hong-sun.

The Mousetrap Netflix webtoon adaptation premieres globally on August 28, 2026, and it's easy to miss that it started life as a webtoon at all. Most of the pre-release coverage frames Mousetrap as a star vehicle for Ryu Jun-yeol and Sul Kyung-gu's first pairing, with the source material mentioned in a single line if at all. The original is Field Mouse (들쥐), a horror-thriller webtoon by Ludovico that ran on Kakao Webtoon from 2017 to 2020, a completed series with a real, sizable readership behind it, not just a licensed premise built for TV.

Key Takeaways

• Mousetrap streams globally on Netflix starting August 28, 2026, with all 10 episodes dropping simultaneously.
• It adapts Field Mouse, a completed Kakao Webtoon horror-thriller by Ludovico (2017-2020).
• Ryu Jun-yeol and Sul Kyung-gu lead the cast in their first project together, joined by Lee Kyoo-hyung.
• Kim Hong-sun (Voice, The Guest) directs a script by Lee Jae-gon.
• The story pulls from a Korean folktale about a rodent that becomes human by eating fingernail clippings.

Mousetrap Netflix Webtoon Adaptation: What Happened

Netflix confirmed Mousetrap's August 28, 2026 premiere date through its official announcement, releasing a teaser trailer and poster to go with it. The series casts Ryu Jun-yeol as Moon-jae, a reclusive novelist whose identity is systematically stripped from him by a figure known only as the Rat, and Sul Kyung-gu as No-ja, a loan shark from Moon-jae's past who becomes his reluctant partner in tracking the thief down. Lee Kyoo-hyung rounds out the main cast as detective Sun-yong. Kim Hong-sun, whose credits include Voice and The Guest, directs from a script by Lee Jae-gon. The season runs 10 episodes, all available at once rather than a weekly release.

The premise sounds like an original K-drama concept, but it's a direct adaptation. Field Mouse (Korean title 들쥐) is a completed webtoon by the artist Ludovico that serialized on Kakao Webtoon from 2017 to 2020. Kakao Webtoon's own listing for the series tags it as horror/thriller (공포/스릴러) and shows around 26.57 million cumulative views and 230,000 likes, a substantial readership for a title that has had almost no visibility in English-language manhwa coverage before now. The webtoon's total chapter count wasn't independently verifiable at the time of writing; Kakao's page doesn't list it in the excerpt available, and the series isn't indexed on AniList or MangaDex, so treat any chapter number you see elsewhere with caution until an official source confirms it.

The Folktale Underneath the Thriller

Both the webtoon and the Netflix adaptation build on a specific piece of Korean folklore: a field mouse (or rat, depending on the translation) that grows the ability to shapeshift into a human by eating fingernail clippings people throw away, then goes on to steal that person's identity and life. Mousetrap literalizes this as psychological thriller mechanics: Moon-jae doesn't just lose people close to him, he loses his fingerprints, his passwords, his bank access, and eventually the ability to prove he is who he says he is. It's the kind of premise that reads as more grounded body-horror than most webtoon-to-drama adaptations attempt, and it's a big part of why Field Mouse built its following on Kakao Webtoon in the first place.

Why It Matters

Manhwa-to-K-drama adaptations tend to get covered from one angle or the other, not both. Entertainment press treats Mousetrap as a Ryu Jun-yeol vehicle and barely names the webtoon; manhwa-focused coverage of Kakao's horror-thriller catalog rarely crosses over into what's landing on Netflix next. That gap is exactly where a title like Field Mouse falls through, a completed series with 26 million-plus views that most readers of our guide to 2026's manhwa K-drama adaptations won't have heard of, because it wasn't on anyone's radar until a premiere date landed. The same pattern played out with Get Schooled's adaptation as Teach You a Lesson: a completed webtoon with real numbers behind it, invisible in English coverage until Netflix put a release date on it.

Mousetrap Netflix Webtoon Adaptation: Where to Watch and Read

Mousetrap streams exclusively on Netflix starting August 28, 2026. The source webtoon is a different story: Field Mouse is hosted on Kakao Webtoon in Korean, and no official English translation has surfaced yet. That puts it outside every platform covered in our breakdown of where to read manhwa legally in 2026. If the show does well, an English license is the thing worth watching for, not something readers can act on right now.

The official cover for Field Mouse (들쥐) on Kakao Webtoon, the Ludovico horror-thriller Mousetrap is adapted from.

Related Reading

• Manhwa K-drama adaptations 2026: what to read first
• Teach You a Lesson: Netflix K-drama based on Get Schooled
• Where to read manhwa legally in 2026

Frequently Asked Questions

When does Mousetrap premiere on Netflix? Mousetrap premieres globally on Netflix on August 28, 2026. All 10 episodes release at once, so the full season is streamable from day one rather than a weekly rollout.

Is Mousetrap based on a webtoon? Yes. Mousetrap adapts Field Mouse (들쥐), a horror-thriller webtoon by Ludovico that ran on Kakao Webtoon from 2017 to 2020. The Kakao Webtoon listing for the series shows roughly 26.57 million cumulative views and 230,000 likes.

How many episodes does Mousetrap have? Mousetrap runs 10 episodes for its first season, all released together on the August 28, 2026 premiere date.

Who stars in Mousetrap? Ryu Jun-yeol plays reclusive novelist Moon-jae and Sul Kyung-gu plays No-ja, a loan shark turned investigator who helps him. Lee Kyoo-hyung plays detective Sun-yong. It's the first project pairing Ryu and Sul as co-leads. Kim Hong-sun (Voice, The Guest) directs from a script by Lee Jae-gon.

Where can I read the Field Mouse webtoon? Field Mouse is hosted on Kakao Webtoon in Korean; an official English translation was not available as of this writing. Readers who don't read Korean will need to wait for the Netflix series or a licensed translation to announce.

What is Mousetrap about? A reclusive novelist named Moon-jae has his identity stripped away by a mysterious figure called the Rat, who takes his fingerprints, passwords, money, and name. Moon-jae partners with a loan shark named No-ja to track the Rat down, and the hunt blurs the line between who's telling the truth. The premise draws on a Korean folktale about a rodent that turns into a person by eating discarded fingernail clippings.

References

• Mousetrap official announcement (About Netflix)
• Field Mouse (들쥐), Kakao Webtoon official page
• Webtoon-Based Live-Action Series Mousetrap Premieres on Netflix on August 28 (Anime News Network)