According to Zhihu official website, Three Wan Li in Chang 'an is adapted from the novel of the same name by the famous writer Ma Boyong. The film is set in the prosperous Tang Dynasty. After Three Wan Li in Chang 'an tells the story of An Shi Rebellion, the whole Chang 'an fell into chaos because of the war, and Gao Shi, who was in it, recalled his past story with Li Bai.