Go Eun Sung (Han Hyo Joo) has lived a life that parallels that of a fairytale. Her loving father adores both her and her autistic brother, while her stepmother holds ill feelings for Eun Sung, who she believes is getting everything her own daughter is deprived of. When her father tragically passes away, Eun Sung finds herself kicked out of her home and her brother goes missing. With perseverance, Eun Sung works hard to support herself, all while continuing to look for her brother. When she encounters Jang Sook Ja (Ban Hyo Jung), the CEO of a food company, Eun Sung is brought into her family to inherit her fortune and company, sparking a bitter rivalry between Eun Sung and Hwan (Lee Seung Gi,) Sook Ja's spoiled grandson.