4th Period Mystery
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.
- Year: 2009
- Country: South Korea
- Genre: Crime, Mystery, Thriller, Action
- Studio: Sway Entertainment, Lotte Entertainment
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