During fourth period, high schooler Da-jeong finds his 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.
Kang So-ra | Lee Da-jeong | |
Sang-geun Jo | Kim Tae-gyoo | |
Jeong Seok-yong | Kang Gook-man | |
Jeon Jun-hong | Embassy | |
Lee Young-jin | Yun Sang-mi | |
Kim Dong-beom | Do-il |
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