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.
Directed by Lee Sang-yong
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Cast
Yoo Seung-ho
Han Jung-hoon
Kang So-ra
Lee Da-jeong
Jo Sang-geun
Kim Tae-gyoo
Jeon Jun-hong
Byeong-soo
Jeong Seok-yong
Kang Gook-man
Park Cheol-min
Crazy
Rie Young-zin
Yun Sang-mi
Kim Dong-beom
Do-il
Jo Yoon-hee
Hong Ju-hee
Lee Chan-ho
Tak Teuin
Min Kyung-jin
Headmaster
Im Soo-hyang
Fan
Kim Young-woong
History teacher
Jung Young-ki
Student in Grade 2 Class 5
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