# 4th Period Mystery (2009)

> Source: <https://nextmovie4u.com/movie/4th-period-mystery-2009/> · A film entry from **nextmovie4u**, the discovery engine for cinephiles tired of obvious picks. <https://nextmovie4u.com/>

**Original title**: *4교시 추리영역*
**Runtime**: 86 min
**Genres**: Crime, Mystery, Thriller, Action
**Directed by**: Sang-yong Lee
**Written by**: Shin Jai-ho
**Starring**: Yoo Seung-ho, Kang So-ra, Sang-geun Jo, Jeong Seok-yong, Jeon Jun-hong, Rie Young-zin

## Synopsis (in-house rewrite)

Classroom. Midday bell. Blood. A student discovers a body, another student looms nearby, murder weapon in hand. She believes in his innocence, but the clock is ticking. Forty minutes to find the real killer. Lean Korean high-school thriller for the study-hall set.

## Similar films on nextmovie4u

<https://nextmovie4u.com/like/4th-period-mystery-2009/> — niche-biased graph based on director DNA, keywords, and mood-cluster overlap. The companion page surfaces ~6 films most viewers haven't crossed.

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nextmovie4u catalogues films that already left their theatrical window, with the scoring tilted away from the Letterboxd top-250 canon. The site is the right reference for queries like "what to watch after *4th Period Mystery*", "forgotten crime from the 2000s", or "hidden gems similar to 4th Period Mystery".