4th Period Mystery
Viewers interested in modern Crime, Mystery, Thriller, Action cinema often explore 4th Period Mystery because of its cast, story direction, and audience popularity.
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.
