This is a work based on the historical facts of the founding of Joseon, adding imagination about evil spirits and exorcism. The story revolves around the complicated desires between King Taejong and his two sons, Chungnyeong and Yeongnyeong, and the confrontation with the evil spirits that covet these desires. It tells the story of Lee Seong-gye, who did not have enough power to overthrow the ancient dynasty, and his ancestors Mujo, Ikjo, and Hwanjo, who sought help from the Pope in order to establish a country. The Pope supported the establishment of Joseon to replace the Buddhist country "Goryeo". In order to obtain new subjects, the exorcists in the Western Regions and the undead creatures summoned by the exorcists were mobilized at that time. After the founding of Joseon, the hidden undead creatures that were completely killed by the Lee Dynasty were resurrected again. Jang Dong-yoon will play Chungnyeong Daegun in "The Exorcist of Joseon". He believes that all godsends have a reason for existence, so he can treat everyone equally regardless of their wealth. Gan Woo-sung plays King Taejong in "The Exorcist of Joseon". He is a person who sacrifices many innocent people in order to strengthen the royal power and exclude relatives, and eventually even abandons his own son. Park Sung-hoon will play the arrogant and confident Prince Jangnyeong in the drama. He has a hot temper and is power-oriented. In order to build his own kingdom, he and his ministers who support him plunge Joseon into chaos. Jung Hye-sung will play the role of Wuhua, a member of the "National Wu Party". He lost all his family and survived alone. He has been full of spirit since he was seven years old. He was trained to be a shaman at the age of ten.