As a front-line criminal policeman, Li Chengyang (played by Sun Honglei) was constantly attacked by his protectors, framed by evil forces, and even framed by his immediate superior, the police chief and others in order to stop his investigation, which led to his imprisonment. He was eventually freed under the command and leadership of the Central Political and Legal Commission and the Central Supervisory Group. Later, he joined forces with the public security, procuratorial, judicial and judicial departments to wipe out the two major evil gangs that had been entrenched in Zhongjiang City for more than a decade, and brought the protectors of the evil forces and corrupt government officials to justice, restoring a clean political ecology to Zhongjiang's political arena and a clear social environment to the people of Zhongjiang.