Six men and women who spent their school days hurting other friends, and one day when they were living a normal life after graduation, they were kidnapped by someone in an unknown enclosed place. They struggle to get away without even knowing why they were kidnapped there. At that moment, a Haheo masked criminal appears to them. The criminal is a victim of school violence, which he suffered throughout his school days. The criminal designed this revenge by seeing them living well without even remembering the school violence they had committed against to him. The criminal begins to ask them questions about their crimes. They are asked the same question in each round, but they do not remember the school violence they committed in school, and they are tortured one by one. They are constantly suffering from the fear of death without getting the right answer and trying to remember the sins they committed in the past..