A girl named yoona transfers to her new school,Seoul Arts High School,and meets a new friend,Sehun.Yoona's cousin,Kris,attends the same school and class.Yoona and Sehun became best friends.However,one day,Sehun came to class late and had bruises all over his body.During recess,Yoona approach Sehun but he ignored her.Whenever yoona approached him,he will always ignore her since then.They had been distanced after a  while.Read to find out more.