After ten years behind the bars in Taiwan, Kong Sai-Hao finally returns to Hong Kong. Besides hoping to find his daughter Yau-Yau to mend their relationship, he also plans for revenge. On one hand, he pretends to surrender to triad boss To Yik-Tin, the man who caused him to be jailed. On the other hand, he tries to gain trust from police officers Chung Lap-Man and Lee Pak-Kiu. Pak-Kiu refuses to have a criminal as his friend, but Lap-Man becomes a undercover cop in Sai-Hao's gang. Along with Sai-Hao, they overrule Yik-Tin and take over the mafia, and the two develop a misconceived mentor-student relationship. Unfortunately, Lap-Man gets fired from the police force before he can finish his mission in the mafia. He becomes Sai-Hao's people and turns his back against the police force.
KIU receives a message from MAN and he brings everybody to the drug factory. Upon arrival, he discovers that the place is emptied already. XIAO teases them arrogantly and YAN arrives to speak for his team. YAN warns KIU that he will be punished if he continues to ignore the rules of the police force. After a series of test, XIAO believes that MAN has nowhere to go and he needs to seek help from him. On the other hand, XIAO is surprised to discover that CHIU is still alive after the attack even though he is unconscious now. SUM is missing and MAN suggests YOU to take charge of the restaurant. XIAO is shocked… KIU meets YAN when visiting CHIU. Later, KIU receives a mysterious message… MAN delivers drugs to the drug factory but the factory-in-charge says that there are a lot of impurities inside the drugs. XIAO arrives at the factory to investigate the case and he suddenly hears a loud noise from outside. The noise is created by YOU…
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