On the night of September 16, 1998, a torrential rainstorm struck Yunhe Town in Diannan City. The Ancient City Museum was robbed, and the Diannan King's Seal and Gold-and-Jade Burial Suit, hailed as treasures of Diannan, were stolen. Both national treasures are closely tied to legends of the Diannan King and the ancient Dian Kingdom. After the crime, city bureau leaders gave the case their utmost attention.
They immediately ordered the Cultural Relics Investigation Squad and the Ancient City Branch to form the September 16 Special Task Force. After consulting with the leadership, they decided to have undercover investigator Duan Jinghong infiltrate the cultural relics crime syndicate, while the entire task force assisted with the investigation. Ye Lancang was appointed Duan Jinghong's liaison, as well as his support and cultural relics consultant.
Taking the alias Duan Xiaolong, Duan Jinghong begins a covert hunt for the stolen artifacts and the forgeries surrounding them. He goes to the underground black market to approach his target, earns the man's trust, and infiltrates the criminal syndicate. Duan Jinghong and Ye Lancang then work together seamlessly, repeatedly sabotaging the syndicate's deals. The battle between good and evil has begun. Can Duan Jinghong recover the stolen relics and bring down the criminal syndicate?
