Eun Nim is a Teachers College student who has a part-time job and lives a hard-working life. She meets Kang Ho at the college by accident. He falls for her and keeps asking her out. One day, Eun Nim's father falls into a coma after his business goes bankrupt. Eun Nim decides to be a surrogate mother to raise money for her father's surgery. Se Hoon and Sun Young are an infertile couple in desperation. And Hyang Sook, Se Hoon's mother, forces them to hire a surrogate mother. How will Eun Nim's decision to be a surrogate mother affect the people around her and her relationship with Kang Ho?