He Dachuan was killed in helping his brother Huo Zhenshan to escape. Twenty years later, Huo Zhenshan opened a martial arts gym in Shanghai and looked for He Dachuan's descendants. Facing the challenge of the black market boxing hall, Huo Zhenshan defeated his opponent but refused the bounty, making the witness Shitou respectful. Shitou turned out to be He Dachuan's long-lost child!...

In the early summer of 2019, in the southern city along the river, the narcotics police officer Cheng Jie was bitten by a drug dealer during a raid. His apprehended accomplice revealed that the fleeing drug dealer was HIV-positive, leading to suspicions that Cheng Jie might have been infected with the HIV virus. While awaiting the test results, Cheng Jie, driven by a strong sense of duty, never gave up. He tenaciously tracked the drug source, engaging in clever and courageous battles with his team leader Liu Yunfei and other comrades against the drug dealers. After a painstaking investigation and a life-or-death confrontation with the drug dealers, they successfully dismantled the drug trafficking group in the city and captured the drug lord Yang Jiang. In the end, it turned out that the drug dealer who had bitten Cheng Jie did not have HIV, but Cheng Jie demonstrated the determination and will of a narcotics officer to eradicate drug-related evils....