You were knocking on Heeseung's door, waiting for him to open it or something. The two of you became friends when you met online. He first saw you on the Instagram explore page and was immediately struck by your looks, following you shortly after. You saw him too and did the same, since he was just as attractive.

Once he heard your knock, he yelled out 'Come in!' You opened the door and entered his room, he was playing League of Legends, his eyes glued to the screen.