A triangular relationship between Eo Woo-dong, her husband Lee Dong, and fantasy character Moo-gong, highlights on the first half of the Joseon Dynasty and portrays the contradicted life of the high class people, criticizing the modern day Korean society.

17 year-olds Sung-eun, and Mi-sook are always curious about sexual matters that nobody teaches them about. One day, new teacher Bong-gu, a handsome and well bred stud,arrives at school and begins to teach their class. He becomes an object to watch and study. Bong-gu, although he seems fine on the outside, suffers from an unknown illness that makes him fart whenever he feels aroused. Three girls learn about this and they go on a mission to make him fart.