A young woman lives, hidden in plain sight in a ruined Hong Kong building after a tsunami destroyed the city - a castaway on a concrete island. Her concealed existence is changed forever when a small child literally floats into her life.

Former cop-turned-bar owner Kwok and his underachieving half-brother befriends a drunken woman, they soon find themselves targeted by both her former lover, a high-powered attorney, and the gangster he employs. A suitcase full of tainted cash enters the picture as Kwok finds himself torn between the gangsters and his former colleagues.

A school is trying to sabotage a student group's efforts to put on a musical dance number, citing their atrocious grades. The group's leaders must lead everyone to the promised land of academic competency via some innovative cheating methods.