Former undercover agent Lu Chengfeng replaced Lu Songwen, one of the "Five Tigers" of the powerful group who died, and sneaked into the group to investigate Du Hong, the real murderer of his brother. With his ruthless skills and astute mind, he thwarted the seizure of power, countered murderous intentions, and cleverly dealt with the temptation of Lu Songwen's wife Wen Lanlan. With the cooperation of the police, he took advantage of the internal strife in the group to bring down multiple forces and approached the "kitchen", the core drug manufacturing den. During this period, he encountered repeated suspicion, temptation and betrayal. Finally, with the assistance of Interpol Wen Ruyu, he destroyed the drug manufacturing den and brought Du Hong to justice, not only avenging his brother but also clearing his own grievances.
