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....

Penghai City Public Security Bureau detected that the city is hiding two drug lords "Playboy" and Wu Hongkai. In order to eliminate them, director Chen Wentao set up a task force responsible to solve the case. The police officer Gao Zhiyuan is grief-stricken by the unexpected death of his fiancée. Chen asked Gao Zhiyuan to secretly join the task force and asked him to go undercover to collect evidence for Wu Hongkai's company on the pretext of avenging his fiancée, Ai Li. With his natural vigilance and extraordinary qualities, Gao Zhiyuan, under the leadership of Director Chen and with the cooperation of all the police officers in the city bureau, overcame many difficulties to find out the truth and solve the mystery, and justice prevailed over evil. Gao Zhiyuan completed the difficult task assigned to him by the organization, and also brought light to his fiancée Ai Li who was killed innocently....