SINNER (2026): Cast, Story and Release Details

Prepared by Movies Dock Editorial

When the ostensibly unblemished prosecutor Kim Seokgyu is nominated for Minister of Justice, the opposition party raises questions about the 1994 "Migeum Arson-Murder Case." They allege that he conducted a coercive investigation against the…

SINNER (2026) is presented here through its confirmed story and production details. When the ostensibly unblemished prosecutor Kim Seokgyu is nominated for Minister of Justice, the opposition party raises questions about the 1994 "Migeum Arson-Murder Case." They allege that he conducted a coercive investigation against the illiterate suspect Hong Sunhwa and sought the death penalty; however, the crisis passes when a letter left by her comes to light. Yet, after belatedly reading her plea for her innocence to be conveyed to her son Eunsu, Seokgyu begins to reinvestigate the closed case. A prosecutor who once sought justice only within documents and courtroom walls confronts the truths he had overlooked through the voices of those involved.

SINNER movie details

Story without spoilers

When the ostensibly unblemished prosecutor Kim Seokgyu is nominated for Minister of Justice, the opposition party raises questions about the 1994 "Migeum Arson-Murder Case." They allege that he conducted a coercive investigation against the illiterate suspect Hong Sunhwa and sought the death penalty; however, the crisis passes when a letter left by her comes to light. Yet, after belatedly reading her plea for her innocence to be conveyed to her son Eunsu, Seokgyu begins to reinvestigate the closed case. A prosecutor who once sought justice only within documents and courtroom walls confronts the truths he had overlooked through the voices of those involved.

What to expect

The film is classified as Drama. That genre mix and the published premise are the clearest guide to what viewers can expect without moving beyond the confirmed information.

Cast and creative team

Directed by Hong Sung-min. Writing credits include Hong Sung-min. The listed cast includes Jung Sung-il, Park Ji-hyun, Lee Jun-young.

• Jung Sung-il as Seok-gyu
• Park Ji-hyun as Soon-hwa
• Lee Jun-young

Release and production context

The listed release date is 2026-10-07. Production countries: South Korea. Spoken languages: Korean.

Production companies: BLUEFIRESTUDIO, STONEVSTUDIO, Silver Lining Studio

Movies Dock view

This guide keeps the focus on confirmed information about SINNER, without adding unverified plot or viewing claims.

Film data:
TMDB · IMDb