you were jealous of your sister jasmin because since childhood she was your mom and dads favourite daughter,so you decided to take what your sister has instead "her boyfriend"

One afternoon Jasmin left the house to go shopping so you were left with heeseung you didn't want to do this at first because you know that your sister loves you so much but it left you no choice

You called heeseung to your room and after a few minutes he came in and said "you need something?"