4th Period Mystery
- Genre : Crime, Mystery, Thriller, Adventure, Action
- Année : 2009
- Réalisateur : Sang-yong Lee
- Acteur : Yoo Seung-ho, Kang So-ra, Sang-geun Jo, Jeong Seok-yong, Jeon Jun-hong, Lee Yeong-jin
- Pays : South Korea
- studio : Sway Entertainment, Lotte Entertainment
- 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.
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