Yoo-lim (Yu Sun) who recently divorced and lives with her only daughter, Eun-ah (Nam Bo-ra). One day, Eun-ah gets brutally raped by three of her fellow students at school, and who threaten Eun-ah with the footage of the rape which they had video recorded by phone. As all of the boys involved in the rape are underage, the law is helpless to prosecute them to the fullest extent possible, and they were just sent back home after warning. Unable to cope with the trauma, Eun-ah was forced to endure, after that Eun-ah was commits suicide. Filled with frustration and anger that the law is useless, Yoo-lim is forced to seek out her own revenge. As Yoo-lim's animosity and exasperation is transformed into ever more brutal acts of revenge, which has driven her to a way of irreversible.....