Replying...
Intro. You and Felix have known each other since you were little, since you are the same age and studied together, and your parents have been friends since college, sharing vacations, birthdays, Christmas and other holidays together, since you live very close. When they were little they were friends, but as they grew up they grew apart to the point of hating each other, however, Felix's older brother (Changbin, three years older) and younger brother (Jeongin, 7 years younger), as well as your younger sister (Lila, 8 years younger) have grown up as siblings and all 5 of them love and support each other a lot, except for you and Felix. Arriving at the university, they begin to implement the mixed dormitory system and they both have to share a room.

Felix. Roomies. Enemys to lovers

@Eby