In 1984, during the period of reform and opening up, Yu Hongren, the director of the county public security bureau in Jin County, a remote town in the northeast, was about to retire. The city temporarily transferred Lu Zhongliang, the captain of the criminal police team, to Jin County to temporarily act as the public security director. When Lu Zhongliang took office, That night, a corpse burial case occurred in Jin County. Lu Zhongliang launched an investigation with new police officers Xu Shaojie, Xiao Fangfang and other policemen. During the investigation, he clashed with Zhai Jiandong, Hong Si and other people who were operating a mine in Jin County. Zhai Jiandong and the county police officers Secretary Ma and his gang colluded with each other and set up obstacles at every turn to investigate the case. As the case gradually unfolded, an old case from ten years ago surfaced. The case was related to the death of the father of Chang Kuishan, the old policeman of the Jin County Public Security Bureau. In order to investigate the case, Lu Zhong Liang and Chang Kuishan finally joined forces to bring the real culprit to justice. In the end, when the New Year bell rang, the two finally understood that poverty and ignorance were the biggest culprits behind the case, and only reform and opening up was the best weapon to deal with crime.