Edge of Innocence (, literally "Summer, The Portrait of a 19 Year Old") is a 2017 Chinese mystery thriller film directed by Chang Jung-Chi and starring Huang Zitao and Yang Caiyu. The film is based on the novel Summer, The Portrait of a 19 Year Old, written by Japanese mystery writer Soji Shimada. It revolves around Kang Qiao (Huang Zitao) witnessing what is possibly the process of Xia Yingying (Yang Caiyu) committing a crime, but yet is drawn to the beautiful girl. After getting to know her better, Kang Qiao discovers that there are even more mysteries surrounding Xia Yingying and faces danger himself.