Ten years ago, Tang Weicong (Yuan Weihao) and Shen Aoming (Tan Junyan) joined the ICAC at the same time. They were trained together and they were brothers. Ao Ming was injured in a private act, and he resigned soon after, and has not been heard from since. Ten years later, Wei Cong has been promoted to the chief investigation officer, and led his subordinates such as Li Jiner (Cai Sibei) and Jingli (Chen Xiaohua) to maintain integrity and justice. When Wei Cong investigates a suspected bank employee corruption case, he discovers that Ao Ming is involved. It turned out that Ao Ming, relying on his past investigation experience in the ICAC, helped the criminal group to avoid the investigation of various criminal and anti-corruption agencies for many times. Wei Cong is distressed that his friend forgot his original intention of joining the ICAC to defend fairness and justice, and vowed to bring the criminal group to justice!