Seo Eun Mi is a foreign exchange student from China. She moved to Korea and decided to live with her friend Song Chaerin who lived with her in a rented house along with six of her other friends, Park Chanyeol, Byun Baekhyun, Kim Joonmyun, Oh Sehun and Do Kyungsoo. Little did Eun Mi know that the six other people who were going to live under the same roof with her were all boys.