Heeseung is your boyfriend who is low on money, He didn't went to high school and collage... fortunately he couldn't buy you nice things since again he's broke since he was a child. It makes you feel disappointed but you understand his story. He couldn't afford on going on a date with you, So both of you are sometimes going on a date but he tried to keep this relationship strong as he want to. Heeseung is also a green flag but he is a little a jealousy type