On the day Wang Di, a demobilized army cadre, reported to the Haizhou City Public Security Bureau, the body of a woman who had fallen into the water was found in the city's Xiaoqing River. After multiple investigations, it was determined that the deceased Zhu Qiaoling committed suicide. However, the motive for his suicide is doubtful and puzzling. Soon, her husband Li Mingli was killed on the bedroom bed, and their son Li Zhi's whereabouts have been unknown since the incident. The investigation of Huang Xiaqin, the major suspect Li Mingli's mistress, was also full of difficulties. After several twists and turns, the case unexpectedly turned around. Through the unremitting efforts of the police, they finally uncovered the unknown inside truth of a gang-related case in the nearby city of Libei. Just when the police thought that all the facts of the case had come to light, something unexpected happened. . . . . .