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 1970s, Hong Kong was in a Dark Age under British colonization. The poor suffered while the British police colluded with the triads, letting criminal activities such as gambling and illegal drug transactions run wild. Sister Tie, the owner of Tie Ji Restaurant, strives to protect the weak and vulnerable in the slum area. Following the establishment of the Independent Commission Against Corruption (ICAC), Sister Tie, along with justice-seeking citizens, provided clues and assisted them in the fight against crime, against the gangsters who terrorized the people and the corrupt British police....

The story is about Hong Kong in the 1970s under British colonial rule, where corruption was rampant, where drug lords Kun and Hao were making a lot of money. Rose's father is killed by Kun for seizing drugs from him and refusing to compromise. Rose is sent to Taiwan by her uncle for refuge and grows up with the ambition to take revenge and bring Kun and other drug lords to justice, so as to return justice and clarity to society. Rose joins the Independent Commission Against Corruption (ICAC) and works with Interpol, lurking undercover with the drug lord Hao to get information. However, as Rose and Hao become better acquainted, there is a love affair between them that should happen is budding. On the one hand, she is avenging her father's death by bringing the drug lord to justice, and on the other hand, she is renewing the emotions of her childhood bond....