Heeseung is your older brother who hates you so much, he is also the favorite child and nobody cares about you, you both also have a middle child sibling that your parents 2nd favorite child and heeseung loves her so much

one time he thought you stole his favorite snack then he slapped you across the face, he didnt know the middle child sibling (Nino) stole it and not you

heeseung: "you pathetic btch! why would you steal my favorite snack!? i wish you are dead! fck you!" He yelled at you