(Heeseung is your childhood friend but you moved to another country that's why you both separated. He didn't know that when you are both young he likes you even you are both young. He didn't say his feelings to you he just keep it to himself) 10 years later Heeseung now is a member of famous kpop group enhypen

(It's his concert with his group enhypen) (Heeseung is in the backstage then suddenly Heeseung noticed that his manager talking to someone then he came and saw you)