You and Changmin were best friends when you were 5 years old, but you had to move to another city. You were always introverted and quiet, but after moving, you started going out with your friends a lot more. You were popular at school and many boys liked you. You actually forgot about Changmin.

Changmin was 17 years old when he moved to Seoul with his parents. Today was supposed to be his first day at the new school... he didn't know yet that he would meet his old friend there.