Maria, the bright and caring poster girl of an inn, one day swaps places with the mistreated noblewoman Charlotte. What Charlotte had been enduring was a gloomy and harsh daily life amidst the intertwined ulterior motives unique to high-ranking nobles. Eventually, she was almost killed by having poison mixed into her tea. Faced with such a situation, the gutsy Maria cannot remain silent! The mean stepmother and sister, the cold-hearted father and brother, and the sadistic fiancé ── she will punish them all swiftly!