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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.
16 Cast Members
Lee Beom-soo
Hwang Chang-wook
Yoon Jung-hee
Choi So-yeong
Nam Gyu-ri
Kang Yi-na
Kim Bum
Kang Hyeon
Son Yeo-eun
Yoon Myung-hyo
Lee Eol
Security guard
Kim So-hee
Ji-won's mother
Kong Jeong-hwan
Lee Chi-yeong
Ham Eun-jung
Kim Ji-won
Yang Ji-won
Min Hye-yeong
Lee Chae-won
Yeom Ji-hyang
Kwon Hyun-sang
Cha Jae-wook
Son Ho-jun
Jo Beom
Choe In-Suk
Myung-hyo's mother
Choi Bae-young
Park Hyun-gyeong
문웅기
Kim Hyung-jin
