Jun arrives in Hong Kong from mainland China, hoping to be able to earn enough money to marry his girlfriend back home. He meets the streetwise Qiao and they become friends. As friendship turns into love, problems develop, and although they seem meant for each other they somehow keep missing out.

Centers on Captain Manfred who is caught in the line of fire between high levels of corruption and malice. He must solve a brutal murder to prove his partner's innocence and unearth the truth behind Hong Kong's police force. The investigation brings him to an unlikely collaboration with sly, man-of-the-world Inspector Kee from the Narcotics Bureau, whose motives are not what they seem.

Months after the events of the original film, Ming suspects a police superintendent as being a new mole for the triads, while years earlier, Yan embarks on his first mission.