Crimes are committed by everyone, regardless of whether they are adults or children. After his daughter was tortured to death by several minors, single father Li Changfeng (played by Wang Qianyuan) embarked on a desperate road of revenge. He seemed to want to make the young demons pay the price they deserved in his own way. Facing the pursuit of Li Changfeng and the police, what kind of punishment will these juvenile offenders receive? The film is adapted from Keigo Higashino's novel of the same name.