Synopsis: Yoon-gap is a government officer who works in the palace. He has a good reputation and has a handsome appearance. One day, Yoon-gap's body becomes possessed by an Imoogi creature. Soon afterwards, people start talking about him as if he has lost his mind. The Imugi who possessed Yoon-gap is related to Yeo-ri, whose first love was Yoon-gap.Yeo-ri is the only granddaughter of a famous shaman. She has a divine gift but refuses to accept her fate as a medium of spirit. Instead, she works as a glass craftswoman. The Imugi needs Yeo-ri's body to ascend to Heaven, but Yeo-ri won't allow it. After Yoon-gap becomes possessed, Yeo-ri enters the palace filled with powerful female ghosts and evil spirits.Meanwhile, King Lee Seong is a reformist monarch who dreams of a strong Joseon nation. Weird and terrible incidents continue to take place within the palace. These are related to the powerful female ghosts who hold a grudge against the royal family. To get rid of the ghosts, Yoon-gap, Yeo-ri, and King Lee Seong search for the secret of the female ghosts.