Return to the Palace

Yoon Gab is a government officer who works in the palace. He has a good reputation and has a handsome appearance. One day, Yoon Gab's body becomes possessed by an Imoogi creature. Soon afterwards, people begin to talk about him as if he has lost his mind. The Imoogi that has possessed Yoon Gab is related to Yeo Ri, whose first love is Yoon Gab.
Yeo Ri is the only granddaughter of a famous shaman, and Yeo Ri herself has a divine gift, but she refuses to accept her fate as a medium of spirit. She instead works as a glasses craftswoman. The Imoogi needs Yeo Ri's body to ascend to Heaven, but Yeo Ri won't allow it. After Yoon Gab becomes possessed, Yeo Ri enters the palace, which is filled with powerful female ghosts and evil spirits.
Meanwhile, King Lee Sung 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 Gab, Yeo Ri, and King Lee Sung search for the secret of the female ghosts.
(source : mydramalist)