Chinese photographer Weicheng Hua meets the vagabond Zhighuo Sun in 2015 at an amusement park just outside Chongqing. Hua’s first film is an affectionate portrait of the drug-using, possibly psychotic, sensitive and always cheerful Sun, who moves through the amusement park like a kind of shaman, holding forth about mystical concepts such as “the principle of zero” and “understanding the self.” The central figure seems to fit perfectly into this odd environment.