You (Hwang miyoung) had recently moved to Korea from the states and entered high school. Oh Sehun had been your first and only boyfriend throughout your high school days. Sehun was the biggest playboy in school. When he asked you out you gave it a chance and you guys fell in love with eachother. You thought he changed into a completely different person. Until one day you saw him kissing a random girl. And the next day.....he broke up with you out of the blue. You haven't forgiven him since. Sehun was recruited by SM Entertainment a month before SM recruited you. Imagine the look  on your faces when you find out that your high school sweetheart was in the same agency as yours......Will this change things between you? Reunited by fate.......