Eun Myeong comes from a very wealthy family, but her life is hell because of her cantankerous stepmother. Unable to bear it any longer, she leaves the family home and finds herself living in the apartment of the mysterious brother of her best friend during his long stay abroad. Problem: He will be back much earlier than expected and in addition, he turns out to be Joon Yeong, the star actor of the moment... How will this forced cohabitation go?