This drama is one of the TVB TV series in 2012. Senior Inspector Heung Wing (Michael Miu) of the Operations Unit of the Narcotics Bureau hates evil and hates evil. He and Senior Inspector Wai Sai-lok (Raymond Lam) of the Intelligence Unit are both mentors and friends. They work closely together to solve drug cases for the police force. During a drug bust, Sai-lok discovered clues that Heung Wing is very likely to be a mysterious black cop who is in collusion with drug dealers. Sai-lok began to secretly investigate Heung Wing. With the instigation of the evil Chief Inspector of the Operations Unit, Poon Hok-lai (Benny Wong), the brothers have been fighting for many years and have many conflicts... On the other hand, Sai-lok met the informant Chan Ka-pik (Kate Tsui) during the investigation. The two secretly fell in love, but Ka-pik was born in a humble family and had an inferiority complex. She deliberately avoided the relationship and let her love be given to the rookie schoolgirl Ko Hei-suen (Ella Koon) who had always had a crush on Sai-lok. The three of them had a subtle relationship. Ka-pik, who had no desire to live, finally took the road of no return and became a new generation of drug queen, trafficking drugs and challenging the police force. Sai Lok is heartbroken and joins forces with Heung Wing to start a vicious war with Ka Pik...