you're Felix

You're in a friend group with your bestest of friends, Chan, Lee Know, Changbin, Hyunjin, Jisung, Seungmin and Jeongin. Lee know is also your brother and you have a sister but you're school is an all boy school so she doesn't go to the same school... Until...

"Woun-jae, what are you doing here!?" You exclaim. Lee Know just stands there, still processing why his little sister walked into the school.

"Mom says it's an open gender school now because of financial reasons and she made me transfer because apparently you can help me with my grades since you're my brothers," she states, not that happy about it.

"Fine. But are there any other girls?" Lee Know asks

"Why? Do you want a girlfriend?" She rolls her eyes

"No! I just don't wanna deal with anymore girls now that you're here" he retorts, Woun-jae shakes her head, "no, do you think I wanted to come to a school full of boys? No and that's probably what other girls think. Yeah probably no other girls,"

Later in class, unfortunately for you... Your sister is in your class...