Old Mr. Lo has three sons and the youngest one Lo Kung is his favorite. However, Kung does nothing but fool around all day long. Old Mr. Lo is very annoyed about this. The relationship between father and son is thus affected. So on Kung's birthday, his two brothers decide to play a joke on him. They trick him into believing he has won the lottery. Kung is so happy that he spends a tremendous amount of money. When he realizes he is in huge debt, he pretends to go insane and the whole family believes him.

While visiting Shanghai, handsome young developer Hong meets the beautiful Kwun. Together they embark on a search for his friends from home, a brother and sister, who have become the targets of a ruthless gang leader, Keung. Now embroiled in a brutal criminal war with gambling and a seductive nightclub singer at the center, the innocents must fight to survive as the stakes rise to include their own lives!