His sister is the gangster Princess!!!

Park Jilla - not an ordinary girl. she is a raise by gangster since her parents died. she lost contact with her brother Park Jimin in south korea. she is cold,silent, not caring and a trash talker to people she doesn't know and sweet, kind , protective to people she love . she is known to be midnight or viper Princess .

what happens if she will be assign to a school were she meet her cousin and a new found friend??
and assign again in another mission in south korea where she will finally reunite with her long lost brother or get mad at him for not finding her ??? what happens if Jimin introduce her long sister to his band members??? will someone fall for his sister ??