Anti-drug team members Tai Hua (played by Jordan Chan), Lao Mi (played by Xie Tianhua), A Feng (played by Lin Xiaofeng), and A Tang (played by Zhu Yongtang) are four brothers who have a close relationship. Many years ago, the four of them participated in the arrest of the transnational drug lord Dad (played by Qin Pei) ), before the operation, the superior, Sir Lu, asked everyone to hand over their mobile phones to prevent eavesdropping. However, Dad bribed the criminal police and the four of them fell into Dad's trap. Unfortunately, Afeng was killed and Sir Lu also died in the operation. Ah Tang completely disappeared from the police force, and the relationship between Lao Mi and Tai Hua became tense. Dad doubts the identity of his right-hand man, Lao San. Lao San has been with Dad for many years and often provides information to Sir Lu in order to protect himself. Lao Mi and Tai Hua worked together to capture Dog Ya, and Lao San shot him to death. He claimed to be an undercover agent and said that Sir Zhou was not the only one who was bribed by his father that year... Tai Hua and Lao Mi started a fight to avenge their brothers.