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.