Chen Guozhong is a senior police detective whose career has reached a low point. He has had many years of grudges with the gang boss Wang Bao. Chen Guozhong wanted to bring Wang Bao to justice, but he was unable to find any favorable evidence. Finally one time, a witness was about to appear in court to accuse Wang Bao of his crimes. Unexpectedly, he was killed by the killer Ajie on the road. Except for the witness's daughter, everyone in the witness's family was spared. Chen Guozhong did not give up and was determined to capture Wang Bao, but he had to face retirement issues because of his age and physical problems. At this time, the police team hired Ma Jun, a rebellious character, to replace him. When Ma Jun joined the serious crime team, he discovered that an undercover agent in the team had been dead for three days. Chen Guozhong determined that Wang Bao was responsible and sent people to arrest him. But because there is no evidence. In order to convict Wang Bao, Chen Guozhong decided to create false evidence. The entire crime team knew about this, except for Ma Jun, who had just arrived, who didn't know the inside story. However, when the evidence mysteriously disappeared, Ma Jun found himself involved in the showdown between Chen Guozhong and Wang Bao.