Henry Roth is a man afraid of commitment up until he meets the beautiful Lucy. They hit it off and Henry think he's finally found the girl of his dreams, until he discovers she has short-term memory loss and forgets him the very next day.
In this prequel to Mou gaan dou (2002), Chan Wing Yan has just become an undercover cop in the triads while Lau Kin Ming joins the police force. Both the triads and the police find an enemy in a rival crime boss.
A royal descendant of an ancient winged tribe embarks on a quest to find magical pearls. When they fall into the hands of a human, he joins a team of unlikely heroes in a race against time to prevent the destruction of his people.