According to the investigation, the ICAC found that the Jockey Club's football betting operator (played by Yin Ziwei) was suspected of illegal activities. When trying to investigate this person, he was killed by a killer (played by Zhou Yumin). ICAC Chief Investigator Lu Zhilian (played by Louis Koo) was investigated by Inspector Liu Baoqiang (played by Zhang Zhilin) of the Serious Case Squad as a witness. After that, the ICAC and the police jointly launched an operation, but in this process, both sides were on guard against each other and the relationship was delicate. According to the information provided by Liu Baoqiang's informant, the behind-the-scenes operator of the gambling was a mysterious figure called Mr. Hua. Lu Zhilian followed the clues and approached the prey, but the other party was extremely cunning and escaped from him again and again. In the process, another former ICAC staff member was killed in the Jockey Club. For the sake of money and interests, humanity is lost...