Eun-Ju (Moon Geun-Young), who lost her father many years ago, finally gets a new family when her mother remarries. Although things seem to have turn better for the cynical Eun-Ju, she immediately faces problems when she meets her new step-sister Hyo-Seon (Seo Woo). Hyo-Seon with her bright character is the apple in her father's eyes and the clear favorite in the house. Furthermore, Eun-Ju's mother also seems to have fallen for the charismatic personality of Hyo-Seon. Making matters worse for Eun-Ju, Hyo-Seon seems to like Eun-Ju's prince Ki-Hoon (Cheon Jeong-Myeong). Eun-Ju decides then and there to take matters in her own hands and exact revenge on her Cinderella like stepsister...