Y/n is Euijin's lil sis. You've been supporting your oppa since he was in The Unit. And luckily, your oppa debuted through The Unit and his group name is UNB. But what surprised you is one of the member is Jun, your bias. You've been a fan of Ukiss for a long time and now he's your oppa teammate??! Wow. Not to forget, you're a problematic student at school. You like to skip your classes and school. Your parents is at Busan and your school is at Seoul and you're living in a dorm with your friends but because of your grade and your problem, Euijin asked you to stay with him. Yes, in UNB dorm with other members. Will it be okay ?