4th Period Mystery (2009)

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.

• Release Date: 2009-08-12
• Runtime: 1h 26min
• Director: Sang-yong Lee