Due to the drunk driving case of Qin Hui, the bank's credit supervisor, Li Wenhai, the deputy captain of the Criminal Investigation Corps, was instructed by his superiors to go to Nanjiang City to investigate. During this process, he found that the evidence pointed directly at the criminal investigation captain Zheng Dawei. In the contradiction between brotherhood and the truth, Li Wenhai chose to continue the investigation. As the investigation deepened, Li Wenhai discovered that Zheng Dawei had a secret connection with Qin Hui and Zhang, the supervisor of Tianhai Group who committed suicide not long ago. Through the clues provided by Liu Xun, many problems of Tianhai Group were discovered and reported in full. Later, the superiors gradually found out that the evidence of both Zheng Dawei and Tianhai Group was not established. Li Wenhai gradually realized that he had fallen into a trap. He turned around and used Liu Xun, who was arranged by Qi Jianyang, to finally uncover the secret of Qi Jianyang's revenge for his brother who died many years ago.