A girl who is intensely curious and at times displays psychopathic tendencies. She lives with her deceased mother, whom she has kept in a kimchi refrigerator. Her father comes home about once a month while drunk to extort money from her. She is a beautiful girl with large eyes. She takes psychiatric medication daily. She enjoys the Dare Game. She hates her father and is terrified of the School Violence Committee.

A girl who swears frequently and is the one who created the Dare Game. She is pretty and has many ear piercings. She dislikes Yu Sarang and loves both the Dare Game and Song Jaemin. She is the girl Jaemin confessed to in middle school; she rejected him then, but has grown to like him now.

A boy who swears a lot and participates in the Dare Game. He was rejected by Subin in middle school and doesn't have much feelings for her anymore. He is incredibly handsome and even has abs. He has a secret crush on Yu Sarang and plays the Dare Game often.

A boy who only swears when he is surprised or angry. He does not participate in the Dare Game. He has a crush on Yu Sarang. He is exceptionally handsome. As a devout Catholic, he tries to help Yu Sarang escape from the cycle of the Dare Game.