During her visit home from studying abroad, Go Eun Sung's father is declared dead from a gas explosion. Her stepmother takes the life insurance money and moves out with daughter, Yoo SeungMi, leaving Eun Sung and her autistic but musically-talented brother, Eun Joo, without money or shelter. Soon after, Eun Joo goes missing, leaving Eun Sung devastated.
The head of a food company, Jang Sook Ja is disappointed by her spoiled grandson and heir apparent, Sun Woo Hwan. After encountering Eun Sung, she is touched by Eun Sung's compassion and work-ethic. Sook Ja's brings Eun Sung to her home and announces that Eun Sung will become the new heir to the company. This understandably upsets Hwan, whose previous encounters with EunSung have already lead to some animosity. To further complicate matters, Hwan is Seung Mi's first love and marriage target.