Ouyang Cong (played by Ouyang Zhenhua), who was newly transferred to the investigation team, has a very high IQ and can easily solve all kinds of complex and bizarre traffic accidents handled by him. Dai Zhengjun (played by Ma Dezhong) is an excellent lawyer who is famous for his unique values and excellent defense skills. With a deployment arrangement, Cong and the serious crime team superintendent Xu Xiyi (played by Wan Qiwen), who has always had a good impression of him, investigated several bizarre cases. During the investigation, when the police were about to "close the net", they found that Jun, who had been staying out of the matter, set up a trap at a critical juncture to make Cong fall into a trap of negligence and manslaughter. This drama is the sequel to "Iron Horse Chariot".