Seohyun WAS Kai's girlfriend. She had an innocent beauty but Kai is one of school's kingka, he likes someone have iness beauty so he left her for Yoona-the y queenka of their school. Seohyun felt dissaponted and went to America for a year. She changed to a girl have both innocent and iness beauty and had a new boyfriend named Sehun. She and Sehun came back to Korea and they met Kai. He wants Seohyun back.