you're new at school and your new friend tells you

"Do you know that there are f4 girls in this school? They are the coolest and richest girls, they are popular, they can bully anyone they want, they have Shin Yuna in the group , the hooligan and rude, the rich don't mess with her well?

and those same F4s entered the class your phone fell to the ground and the same Yuna stepped on the phone and as if nothing had happened