In one of the modern buildings in Hong Kong, a group of well dressed middle-class people are attending a party held by a medical college. Among them are Ka Ho, a doctor, and his sexy partner Mary, a crime woman and a booty buyer from Japan, a German killer named Stefan, a sexy undercover cop for catching a lawless merchant. All these people, not knowing each other, met more than once on the morning of that day. A lucky draw is being held on the stage, everybody has a 'lucky number'. Suddenly fou...