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.

Credits

Sang-yong LeeDirector

Yoo Seung-hoHan Jung-hoon

Kang So-raLee Da-jeong

Sang-geun JoKim Tae-gyoo

Jeong Seok-yongKang Gook-man