Marissa, a 17-year-old daughter of a marquis, was planning revenge on her uncle's family, who came to her mansion as if they owned the place after her parents died. On her 18th birthday, her title will be returned to her... Until that day, she endured bullying at home and at school, hoping to get a big revenge on those who had bullied her. Meanwhile, her fiancé, Delior, unilaterally breaks off their engagement. She learns that Delior loves her uncle's daughter and sister-in-law, Roxanne, and thinks of her as his soulmate. Marissa, who cannot like Delior at all, welcomes the break-up of the engagement. She vows to give him a proper revenge along with his uncle's family! But contrary to her strong will, her body has become emaciated from years of oppression. Reid, a classmate at school and the country's third prince, cannot bear to see her like that, and after the engagement is broken off, he comes to her side...