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"One will die for every incorrect answer."
In a prep-class for year-end exams, a sadistic killer puts the students through mind-games in order to save each other.
Hwang Chang-wook
Choi So-yeong
Kang Yi-na
Kang Hyeon
Yoon Myung-hyo
Security guard
Ji-won's mother
Lee Chi-yeong
Kim Ji-won
Min Hye-yeong
Yeom Ji-hyang
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