A village in the city had a mass fight due to forced land acquisition and demolition. Villager Chang Qing was arrested by the public security organs for accidentally killing the demolition personnel in the fight. The villagers were very dissatisfied with this and reflected the collusion between officials and businessmen, demanding serious investigation and punishment of corrupt officials who made illegal profits from it. When reviewing Chang Qing's intentional injury case, Zhang Yun (Che Xiao), a female prosecutor of the Investigation and Supervision Department of the Municipal Procuratorate, found that the materials reported for arrest were full of contradictions. She then cooperated with Gu Changfeng (Lin Baoyi), the director of the Anti-Corruption Bureau who was responsible for investigating the dereliction of duty behind the village in the city. Starting from the death of the suspect Ma Yicheng in a man-made traffic accident, they followed the clues and found out that the demolition company leader Yang Shengqiang, the owner of "Jin Yuhuating" Jin Yuting (Li Qiang) and others colluded with officials from the land planning and real estate management departments to illegally transfer and resell land and handle the "two certificates" in violation of regulations. In order to evade legal prosecution, Jin Yuting and others bribed Gu Changfeng with money or threatened to kidnap his young daughter. Gu did not back down and received selfless help from Zhang Yun, who had long admired him. In the end, Chang Qing's "intentional injury resulting in death" case was finally determined to be legitimate defense due to Zhang Yun's strict control, and Chang was acquitted. Illegal businessmen and corrupt officials fell into the law, and Jin Yuting was ready to flee abroad with the money; but Zhang Yun was burned by gasoline ignited by the wife of the criminal suspect Ma Yicheng because of her impartiality in enforcing the law...