Yoo Y/n, a young beautiful, the youngest and last child of the Yoo family, lives all alone. Her entire family is said to be murdered. By none other than her own self. Rumors say that she is possessed by an evil spirit, that made the poor girl lose her mind and do the deed. After such circumstances, the said girl is locked up all alone in the huge mansion for over twelve years. It was until one day, one of the old and the only servant of the mansion falls extremely sick. And for the first time in these many years, y/n came out in public. Begging the villagers to allow her to have a treatment of the kind lady that served her for all these times. But being scared of her past, the villagers demand for an exorcism before doing so. So, Park Jimin, the youngest priest of the village was accounted for the job. Where he interacts with the girl. And somehow along the way, he unravels the truth behind entire mystery murder of the family.