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....