A Sun is a 2019 Taiwanese drama film directed and co-written by Chung Mong-hong. The film stars Chen Yi-wen, Samantha Ko, Wu Chien-ho, Greg Hsu, and Liu Kuan-ting. Its story centres on Chen Jian Ho (Wu), a troubled teenager who has been arrested, and Hao (Hsu), Ho's accomplished brother who commits suicide due to familial pressure. It explores Ho's re-entry into society and his father's efforts to acknowledge his son, something he had never done. Juvenile delinquency and suicide are the film's main themes, with visual motifs including light and dark. The film, which incorporates many conventions of Asian cinema, also explores socioeconomic inequality in Taiwan.