Lee Halla is a rich, innocent girl who lives in a big mansion that consists of: maids, butlers, security guards, and her mother and father. Her parents are all about royalty and fancy but she's a rebel with a kind heart. In school, there's a star student, besides Halla. He is popular, handsome, and charming. He belongs to a gang called BTS. One day Halla gets a request from her parents, saying she must marry another man who she barely knows. But when if she actually knows that man too well?