Baekhyun is a heartless Mafia, so it seemed. He sees life differently, is always money-conscious, and never gives a damn about anyone but himself. Love is forbidden in his life after his previous experience until his driver accidentally knocked down a poor girl.

Life has never been fair to Wang Byeol after the death of her parents. She ended up living as a maid to her stepmother and stepsister with so much suffering inflicted on her that she developed Haphephobia. What is the fate of Byeol when her high school arch enemy, Byun Baekhyun turned out to be her stepsister's fiancé?