Since his wife was murdered two months ago, the detective Wen Fang (played by Li Ming) of the serious crime team has become irritable and weird. He is often complained about for being violent with prisoners. During the investigation of a prostitute murder case, Wen Fang met the senior inspector Ji Shaoqun (played by Ren Xianqi) of the regional serious case, and sent his men to help him find the stolen mobile phone. The investigation of the prostitute murder case was intertwined with a gun case. The serious crime team and the detachment investigating the gun case jointly took action. Unexpectedly, the ambush was leaked. The two sides fought fiercely in the teahouse. Wen Fang's brothers were seriously injured. Officer Ji also arrived and was shot by the suspect while helping to chase the suspect. The suspect of the prostitute murder case was initially locked in the serious crime team detective Gao Xiangan (played by Liao Qizhi). Wen Fang was suspended for sheltering his men. With the help of many brothers, the serious crime team caught the suspect wearing a fisherman's hat mentioned by Gao Xiangan, and the suspect confessed to the murder. During the process of escorting the suspect, the suspect handcuffed and injured Xiang'an and escaped. The incidents one after another made Wen Fang suspicious of the internal personnel of the police. With the assistance of detective Xiaomei (played by Ye Xuan), Wen Fang finally found the "old ghost" hidden in the police...