Watch 4th Period Mystery (2009) Online
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- RUNTIME: 1h 26m
- COUNTRIES: South Korea
- Subtitles: 한국어/조선말
During fourth period, high schooler Da-jeong finds her classmate Tae-gyu dead in a classroom and Jeong-hun standing in front of him with blood on his clothes. In order to stop Jeong-hun from becoming the prime suspect, Da-jeong must help him find the real murderer, who is still inside the school building, under 40 minutes before period four ends.
