 Mai Qiang is a 30-year old bachelor, withdrawn, with little in his life besides his job at an isolated signal station along the Yangtze River and his ink drawings he uses as toilet paper. Chen Qing is a hotel clerk, a widow with a young child and an undemanding relationship with her boss Lao Mo. Lao believes she has been raped, so he reports the crime to Wu Gang, the neighborhood cop. Wu investigates, but Chen is uncooperative. Lao then identifies Mai, who is detained and questioned. After Wu gets to the truth of the incident, Mai tries to break out of his loneliness and connect to Chen.