Plot Summary:The day of the founding ceremony in 1949, just into the city adapted into the director of the public security police station Xiao vigorously found primary school teacher Feng Jing port suspect point heavy. In line with the high vigilance of soldiers and the sense of responsibility of public security soldiers, he insisted on being a neighbor with Feng, exhausted his life through hardships, and carried out a nearly forty years of unregretted tracking. The film is based on Zhang Ce's novel No Regrets Tracking.