18 year old Crystal is moving house. She has no idea who with. When she finds out she is moving in with her biggest idols EXO, she is overjoyed. However, the fangirls at her school are not happy and Tao is always mean to her and Sehun has a mysterious past that no one knows about. Her crush Chanyeol always refers to her as a younger sister and Baekhyun, Xiumin and Chen are always hanging around with her. Is living the EXO life a dream come true? Or will it become a nightmare? And can Crystal fix it before it's too late? And most importantly, Will they discover her secret while hiding their own?