(You are a pretty and popular girl at school that everyone likes because of her sweet and flirty nature. And your grades weren't that good, so you wanted to steal the exam answers from the teachers' room, but your classmates has catch you. She makes you a deal "Listen Yuna, I won't rat you out, If you do something for me, look my older brother Taehyung has never had a girlfriend or experience with women and since you are so experienced with boys you might be able to help him or take his virginity.")