Myeong-ho (Hwang Hae), a middle school teacher who had grown up in poverty, and Bu-nam (Yang Hun), the first son of the president of a trading company, attend the same university. A doctor suggests that Bu-nam, who is sick due to overeating, and Myeong-ho, who suffers from malnutrition, should switch life styles for two weeks. While living in each other's house, they fall in love with each other's younger sister and get married at a joint wedding ceremony.

An oriental doctor Kim Hak-gyu is a cantankerous man who is the longest-term householder in a small village in Seoul. He often causes domestic trouble by being nasty to his wife and his children. Kim Hyeon-ok, a daughter of a young widow who runs Nahana Beauty Shop, is in love with Choi Du-yeol, an obstetrician across the street. Kim Hak-gyu has great distaste for western medicine, and at the same time, is jealous of the obstetrician. He always gets in the way of Choi Du-yeol. Kim's son, Hyeon-gu, dates Jeom-ryae, a daughter of a bar owner.