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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.
Top Cast
Yoo Seung-ho as Han Jung-hoon
Kang So-ra as Lee Da-jeong
Jo Sang-geun as Kim Tae-gyoo
Jeon Jun-hong as Byeong-soo
Jeong Seok-yong as Kang Gook-man
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