Qin Feng, a policeman, and Liu Tianye, who has gradually become the biggest criminal boss in Hanzhou, are brothers and sisters but represent the polar opposites of black and white. With the development of Hanzhou Port near Longwan Village as the background, Qin Feng's solving of the case as an opportunity, gradually stirred up the overt and covert struggles of several interest groups.After several years of battles of wits and courage with local criminals, multiple cases were finally solved one by one.