- Drama: Joseon Exorcist (literal title)
- Revised romanization: Joseongumasa
- Hangul: 조선구마사
- Director: Shin Kyung-Soo
- Writer: Park Kye-Ok
- Network: SBS
- Release Date: March 22, 2021 —
- Runtime: Monday & Tuesday 22:00-23:10
- Language: Korean
- Country: South Korea
When Prince Lee Bang-Won of Joseon patrolled the northern region, he faced an evil spirit which wanted to dominate human beings. Prince Lee Bang-Won was able to seal away the evil spirt.
Now, Lee Bang-Won has ascended to the throne and has taken the title of King Taejong (Kam Woo-Sung). He is cool-headed, but a powerful king. King Taejong is proud of the fact that he helped his father establish the Joseon dynasty. He also feels heavy guilt from killing so many people during the founding of Joseon. The evil spirit which King Taejong sealed away in the past resurrects itself on the land of Joseon. To seal the evil spirit away, King Taejong must again fight the evil spirit.
Meanwhile, King Taejong has sons Crown Prince Yangnyeong (Park Sung-Hoon) and Prince Chungnyeong (Jang Dong-Yoon). Prince Chungnyeong’s only interest is to learn academics. He suddenly faces a crisis caused by the evil spirit. To protect the people of Joseon, Prince Chungnyeong jumps into the war against the evil spirt.
Crown Prince Yangnyeong seems full of confidence. He actually lives with chronic anxiety over whether he will be recognized by his father King Taejong. He tries to be recognized by his father, but his actions never seem good enough. Nevertheless, King Taejong has a strong desire to have his first son Crown Prince Yangnyeong become the next king. Greed then consumes Crown Prince Yangnyeong to enter into a contract with the evil spirit.