Set in modern-day Beijing and 1970s Ningxia, director Xiao Jiang's debut feature explores the power of movies in launching dreams and creating memories. After a bicycle collision leaves Mao Dabing (Xia Yu) with a lump on his head, he promises Ling Ling (Qi Zhongyang), the girl he hit, that he'll care for her fish while she's recuperating. When he stumbles across her diary, he learns the truth about her past -- which rekindles his love of cinema.