Yun Gap is a government official who works at the palace. He has a good reputation and is handsome. One day, Yun Gap’s body is possessed by an Imoogi creature. Shortly afterwards, people begin to talk about him as though he has lost his mind. The Imoogi that has possessed Yun Gap is related to Yeo Ri, whose first love was Yun Gap. Yeo Ri is the only granddaughter of a famous shaman. She has a divine gift, but refuses to accept her destiny as a spirit medium. Instead, she works as a glass artisan. The Imugi needs Yeo Ri’s body to ascend to heaven, but Yeo Ri will not allow it. After Yun Gap is possessed, Yeo Ri enters the palace, which is filled with powerful female ghosts and malevolent spirits. Meanwhile, King Yi Seong is a reformist monarch who dreams of a strong Joseon nation. Strange and terrifying incidents continue to occur in the palace. These are linked to the powerful female ghosts who harbour a grudge against the royal family. To rid themselves of the ghosts, Yun Gap, Yeo Ri and King Yi Seong seek out the secret of the female ghosts.