Thirty years ago, both parents were killed, and the true identity and motive of the perpetrator remain a mystery. Private detective Chen Qiang (played by Aaron Kwok) travels to Malaysia to investigate the cause of his parents' death. However, with his parentsThe person who had a previous relationship recalled the contradiction before and after, and advised him not to continue investigating. During this period, Chen Qiang's home was also inspected by someone entering the room. In a state of isolation and helplessness, he sought help from local private familiesDetective Zheng Fengxi (played by Zhang Jiahui) asks him to assist in searching for the background of his connections and the whereabouts of some important figures. Zheng is currently anxious about his younger brother's situation, but he cannot resist Chen's provocation and resolutely accepts itEntrusted. But from the day we started investigating, various dangers followed closely. The evil shadows intertwined with drugs and desires, the two detectives with their lives hanging on the line gradually approached the truth of the past