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The four team members of the anti-narcotics unit, Tai Hua (played by Chen Xiaochun), Old Mi (played by Xie Tianhua), A Feng (played by Lin Xiaofeng), and A Tang (played by Zhu Yongtang), are close brothers. Many years ago, the four of them participated in the arrest of the international drug lord, Old Dad (played by Qin Pi). Before the operation, their superior, Lu Sir, required everyone to hand over their mobile phones to prevent eavesdropping. However, Old Dad had bribed a black police officer, and the four of them fell into Old Dad's trap. Unfortunately, A Feng was killed, and Lu Sir also sacrificed himself during the operation. A Tang completely disappeared from the police force, and the relationship between Old Mi and Tai Hua became tense. Old Dad suspected the identity of his right-hand man, Old Three, who had been by his side for many years. To protect himself, Old Three often provided intelligence to Lu Sir. Old Mi and Tai Hua joined forces to capture Dog Tooth, but Old Three shot him dead and claimed to be an undercover agent, revealing that Old Dad had bribed not only Zhou Sir but also others. Tai Hua and Old Mi embarked on a fight to avenge their brothers.