音乐家西门(蔡枫华饰)生性风流不羁，乘带领乐团赴韩演奏之便，探望开设跆拳道馆之好友大口(王青饰)。大口投其所好，赞成他在韩国尽情开心，唯独不能打其妹阿淑(李玄丽饰)主意。但机缘巧合之下西门巧遇阿淑，一见钟情，阿淑更以身相许。谁知西门对阿淑只是抱玩弄心情，西门假称要返香港，实则回到大口处向其炫耀其风流史。恰巧阿淑来到探望兄长，闻言伤心欲绝，大口却气到七窍生烟。淑独自躲到雪山，西门冒雪崩危险寻觅阿淑。结果，两人几经艰辛脱险后，有情人终成眷属。

Korea is famous for her charming ladies and tough men, such as top Taekwondo fighter, Big Mouth. When playboy Peter Pan comes to Seoul in the pretext of being with a band, he calls his old friend Big Mouth. Big Mouth's advice to Peter is any woman but not from his household. By accident Peter saves Big Mouth's sister, Moon, and becomes enamored by her. The young couple together on a trip. Peter shakes Moon off and goes to Big Mouth boasting about his loves. He is astonished to find Moon who happens to be Big Mouth's sister. All hell breaks out. Moon leaves home for a mountain retreat. Big Mouth and Peter then set out on a journey to win her back.