4-kyo-si Choo-ri-yeong-yeok 2009

Name: 4-kyo-si Choo-ri-yeong-yeok
Released: 2009-08-12
Cast: Yoo Seung-ho, Kang So-ra, Sang-geun Jo, Jeong Seok-yong, Jeon Jun-hong

Synopsis:

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.