The story revolves around a combat nurse, her daughter's fiancé Nadia dies in an accident, and then she discovers that her daughter is pregnant, and when Nadia gives birth to her child Fathiya, the mother replaces her with a dead child.

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.