4th Period MysteryMovie
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.
About 4th Period Mystery
4th Period Mystery is a 2009 crime, mystery, thriller movie directed by Lee Sang-yong.
The production information lists a runtime of 1h 26m, production credits from South Korea, an original language code of KO.
The credited cast includes Yoo Seung-ho, Kang So-ra, Jo Sang-geun, Jeon Jun-hong. The synopsis above summarizes the central premise without adding details beyond the available title information.
