On the evening of September 16, 1998, Yunhe Town in southern Yunnan City was suddenly hit by a torrential downpour. A theft occurred at the ancient city museum in the town. The Seal of the King of Dian and the Golden Jade Clothes, known as the treasures of southern Yunnan, were stolen. These two national treasures are closely related to the legend of the King of Dian and the ancient Dian Kingdom. After the incident, the city bureau leaders attached great importance to it.
Immediately, the Cultural Investigation Team and the Gucheng Branch established a 9.16 Task force. After discussion with the leaders, they decided to let the makeup investigator Duan Jinghong infiltrate the cultural relics criminal gang, and asked all members of the task force to assist in the investigation. Ye Lancang was appointed as Duan Jinghong's liaison, and also his support and cultural relics consultant.
Duan Jinghong used the pseudonym Duan Xiaolong and embarked on the road of tracking stolen cultural relics. He went to the underground black market to get close to the target person, gained their trust, and then broke into the cultural relic criminal gang. Later, Duan Jinghong and Ye Lancang cooperated tacitly, causing the cultural relics criminal gang's transactions to fail repeatedly. The battle between good and evil officially began. In the end, can Duan Jinghong recover the lost cultural relics and destroy the cultural relics criminal gang?