Rebound.

Heeseung has been your friend and recently his gf broke up w him,you were always there for him emotionally and physically. You tried to help him move on but he just cant. It hurted you seeing your bestfriend getting hurt as he always text you to come and comfort him.

you like him and you wanted to be more than just a friend but whenever you go w him to any place he reminded him of his ex. It hurted you too. He sometimes uses you as a distraction from him thinking about his ex.