Wu Guohao and his childhood friend Da Xiaowei, who came to Hong Kong from Guangdong illegally to make a living. This story tells how they eventually gain the trust of Inspector Xu Le and dominated both the gangs and police in the streets of Hong Kong. Xu Le was originally just a young man with ambition, who'd joined the police originally wanting to serve the public and serve justice. However, he eventually found out that the entire police force are corrupt to the extreme. If he adheres to the principle, will only be sidelined. Under the guidance of his predecessors, he decided to fight in this corrupt system. In a short period of time he becomes one of the most prized detectives, and massively improved the corruption situation. Later on, as his good friend, Wu Guohao's mafia power grows, Xu Le knows that it will be impossible to get him to change and reluctantly joined forces with the Independent Commission Against Corruption. The two brothers who experienced great ups and downs eventually embarked on two different tracks of life, Wu Guohao had to eventually pay a heavy price for his mistakes and incriminating evidence....

In the 1960s and 1970s of Hong Kong, the police and gangsters collaborate, corruption is rampant, and there is a lot of social resentment. At this time, Xu Le (By Wang Haoxin), who is kind and straightforward, drops out of school to join the police because of his poor family. He puts on his uniform and becomes the most common policeman. However, he is expelled and demoted to the Shangshui Police Station for solving a robbery and offending the nephew of Inspector Long (By Li Zixiong). When dealing with an accident, he helps and gets to know the rich girl Bai Zhenni (By Xu Dongdong), who loves Xu Le at first sight....