The "anti-corruption storm" swept through Kuizhou after Luteng City. At the critical juncture when the supervision team was stationed, Li Nanbei (Xiao Yang) and Yu Qing (Fan Chengcheng), a cowardly couple of apprentices, unexpectedly captured the gang leader who had been absconding for many years. For a while, all forces were involved one after another, targeting the Municipal Public Security Bureau led by Yu Hongbo (Li Chengru) and Duan Yi (Yu Ailei). The evil forces are carrying out "legal cleansing" step by step. Strange old cases have emerged, and well-known entrepreneurs and officials have been affected. The investigation process has gone through life and death, and the test for them has just begun.