Ti Lung plays Zeng, an aging police officer whose life takes a difficult turn when his ex-wife is killed in a car accident leaving him responsible for his daughter. Having moved on and remarried he finds that his daughter, CoCo (Sherming Yiu), is resentful and rebellious. Their relationship is strained as the two rarely have spoken since Zeng left when CoCo was aged 5. Rather than trying to fit into her new life CoCo instead turns to her friends and finds solace in a world of nightclubs and drugs. Ignoring Zeng's scolding and attempts at fatherhood, Coco and her friends Bondy and Moondy live a life of pills, raves, brawls and triad boy friends. When Zeng confronts his daughter over drugs he finds in her schoolbag she runs away from home.. Zeng takes some quick tips on parenting from Jenny, resigns fro the police force and tries to find his daughter, who has been drawn into gang violence.