Lau Ching, a Mainlander with an incredibly powerful right arm, arrives in Hong Kong to find his cousin. He befriends with a drifter named Handsome, and a martial artist girl named Mandy. In order to woo her, Ching participates in a fighting competition in hopes of winning a $10 million prize, and must defeat his love rival, Wai, in the ring.

After the total defeat of his love rival, Ching must now deal with the love rival's brother, Wan To, who seeks revenge against him. When Ching is ambushed by Wan To and his gang in the streets and is at risk, he is rescued and treated by an apprentice of his, Beef Skin, and his feisty sister, Beef Stew. It turns out those two are even harder to handle than Wan To.