Students in the 2nd grade 3 class at Yooil High School go on a field trip. There. they are forced to participate in a mafia game of death. They struggle to survive. Lee Yoon-Seo (Lee Jae-In) has excellent observation and reasoning abilities, which she uses to try to escape. Kim Jun-Hee (Kim Woo-Seok) is the class president with a strong sense of justice and responsibility. Oh Jung-Won (Choi Ye-Bin) ranks first at school academically, but she is an outcast and a loner. To survive, she must work with the other students.
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