Main Character

Krystal Jung

Jessica’s younger sister who have the idea to held a birthday party for Jessica.

Jay Park

Jessica’s boyfriends, he help Krystal to preparing Jessica’s birthday party.

Jessica Jung

Beautiful girl, she’s a student in K.K.F.S(Korean Kent Foreign School) An idol in K.K.F.S, she very very love her younger sister named Krystal. They lived together while their parents isn’t in Seoul.