“扫黑风暴”继绿藤市之后席卷奎州，偏偏在督导组进驻的节骨眼儿上，李南北（肖央 饰）和俞青（范丞丞 饰）这对窝囊师徒竟意外抓获了潜逃多年的黑社会头目。一时之间，各方势力纷纷卷入，将矛头对准了于洪波（李诚儒 饰）和段毅（余皑磊 饰）带队的市公安局。黑恶势力正一步步进行着“合法洗白”，离奇旧案沉渣泛起，知名企业家、官员都被波及，调查过程历经生死，而对他们的考验，才刚刚开始。

The “anti-gang storm” swept through Kui Zhou after the city of Green Vine, and at the very moment when the supervisory team was stationed there, Li Nanbei (Xiao Yang) and Yu Qing (Fan Chengcheng), a pair of wimpy masters and disciples, accidentally captured a triad leader who had been absconding for years. In the meantime, various forces are involved, targeting the city's Public Security Bureau led by Yu Hongbo (Li Chengru) and Duan Yi (Yu Ailei). The forces of darkness and evil are step by step carrying out a “legal whitewash”, the dregs of the bizarre old cases, well-known entrepreneurs, officials are involved, the investigation process through life and death, and their test, has just begun.