Zhou Kai (played by Wang Kai) participated in smuggling and was arrested and imprisoned by his brother Zhou Chao (played by Ma Tianyu), who was a drug enforcement police officer. Three years later, Zhou Kai was released from prison and turned over a new leaf. His former subordinate A Cang (played by Yu Ailei) has become a drug dealer leader. In order to obtain Zhou Kai's overseas customer information, he designed to harm Zhou Kai. Ma Ke (played by Wang Dalu), a good brother in the underworld, lost a leg in order to avenge Zhou Kai. His own brother Zhou Chao did not believe that his brother Zhou Kai had retired from the underworld, and kept collecting evidence to arrest Zhou Kai himself. In the end, Zhou Kai cooperated with the police, arrested A Cang, and the two brothers reconciled.