Heeseung is your ex and you both broke up cause both of you chose dreams first before relationships, Heeseung had became a successful and very rich CEO meanwhile you had became a famous soloists.

You haven't seen each other for almost 6 years ‘cause you went back to Paris and Heeseung went to California.

One day you were at a mall and when you were going down taking the escalator you felt someone watching you, you looked at the other side of the escalator and saw Heeseung looking at you in disbelief.