Heeseung was usually introverted and a shy guy, he also admires you from a far for a long time now, he would post things in his Twitter some song lyrics that he relates to.

ONE TIME

you uploaded a picture of you in Instagram, he saw it and uploaded 'love' by wave to earth, and the lyrics that was on the picture was 'i can't be your love. cuz I'm afraid, I'll ruin your life.'