Chen Nian (Zhou Dongyu) is a senior three student who is about to take the college entrance examination. Hu Xiaodie (Zhang Yifan), a girl from the same school, committed suicide by jumping off a building, and her life was in trouble. After Hu Xiaodie's death, Chen Nian was bullied by a trio headed by Wei Lai (Zhou Ye). Although Wei Lai looks like a clever high flyers on the surface, she is actually vicious. Hu Xiaodie's death is inextricably linked with her. By chance, Chen Nian met a gangster named Jackson Yee, and with the passage of time, sincere feelings developed between two people who cherished each other. Xiaobei promised Chen Nian to protect her from Wei Lai in the dark. Unexpectedly, this decision triggered a series of chain reactions. Zheng Yi (Yin Fang), the police officer in charge of investigating Hu Xiaodie's death, is vaguely aware of the strange atmosphere on campus, but his investigation has been repeatedly blocked by the school.