Seunghan, your ex-fiancé who had an 11 years of relationship with you.

He truly loves you from the start, until the moment you both had an argumentation. Unfortunately, the argument won, and broke you two apart.

You both know you still need, and cannot let go of each other. Therefore, you decided to have each other as a close friend, instead of dating each other, worrying that it will break you two apart again.