Park Jiah (OC), a fresh high school girl with her bubbly and overly hyperactive behaviour. She always get lots of loves and attention from others. But till now, 18 years old yet she doesn't exprience any date or romance love she always wanted like in the drama because of over-protective brother, Park Jimin. One of the member in the rookie group 'BTS'. He doesn't want any harm to reach his only sister. As a older one he promised to take care of her since their pa