A beautiful girl named kim Chaeyoung is being bullied by a boy ,Jeon jungkook for about 6 years . After a big incident between those to she takes the decision to change her life completely, so she learn matrial arts and finds a way to become mentally strong because she needs to get over her unpleasant past .She goes to America for a year to fulfill her wish to change. .but what happens when she meet her bully being roomate and friend with her brother ,Kim Nam joon?