Characters:

Lee Donghae and Choi Siwon : Kingka in University
Yoona : An ordinary girl that has a cousin named Seohyun.
Seohyun : Yoona’s cousin. Smart and intelligent.
Jessica: Queenka in school. Her father is the owner of the University.
Sooyoung : Jessica’s bestfriend
Yuri : Yoona’s bestfriend
Sunny : Sooyoung and Jessica’s bestfriend.
Kyuhyun: Lee Donghae and Choi Siwon bestfriend
(Another characters will be revealed in some chapters ^_^)