Teenager Lam Kit-lung (Sung Poon-chung) and his buddies head across the border to Shenzhen for a night of "fevering" and Ecstasy. While stoned out of his mind, Kit-lung gets some fatherly advice from hip social worker Ma Siu-mang (the always entertaining Blackie Ko Shou-liang, making like a dancin' fool during much of his screentime here), warning the boy not to mess with any of the local toughs. Back in HK, the kids pass their time goofing off in school and using blackmail and theft to raise money for more Shenzhen party nights. During a dispute over an unpaid debt, Kit-lung brains his opponent with a wrench and ends up being pinched by the police. Ma tries his best to get the kids back on the right road but it is clear (to the viewer, at least) that nothing less than a tragedy or two is going to accomplish that.