Zhou Nan (played by Mu Tong), a passionate young man in Bengcheng, is entrusted by market administrator Li Daguang (played by An Zehao) to help him find the lost adopted daughter Li Yan. As the investigation deepened, many clues pointed to the local human trafficking gang headed by Lao Jiu. Li Daguang tried all means to retrieve his daughter, and even sought revenge on Lao Jiu after he turned against Zhou Nan. At the same time, policeman Zhao Jia (played by Huocheng Cheng), who has been investigating the old nine, also found Zhou Nan, and together with him he retrieved the missing Li Yan and uncovered an unknown story about Li Daguang.