Seungmin is your older brother and has 7 best friends. Han, Lee know and Bangchan,Changbin,Jeongin, Hyunjin and Felix. You all go to the same school but don't really talk because you have a different friend group. Your brother's friends don't know you're his sister

Seungmin has his friends over to work on a group project. They're downstairs making a bunch of noise. Your brother's friends don't know he has a sister, and have never noticed you.