In a prep-class for year-end exams, a sadistic killer puts the students through mind-games in order to save each other.
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Lee Beom-soo
Hwang Chang-wook
Yoon Jung-hee
Choi So-yeong
Nam Gyu-ri
Kang Yi-na
Ian Kim Beom
Kang Hyeon
Son Yeo-eun
Yoon Myung-hyo
Lee Eol
Security guard
KS
Kim So-hee
Ji-won's mother
Kong Jeong-hwan
Lee Chi-yeong
Hahm Eun-jung
Kim Ji-won
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