- Movie: The Princess and the Matchmaker (English title) / Marital Harmony (literal title)
- Revised romanization: Goonghab
- Hangul: 궁합
- Director: Hong Chang-Pyo
- Release Date: February 28, 2018
- Runtime: 110 min.
- Genre: Period / Romantic-Comedy
- Distributor: CJ Entertainment
- Language: Korean
- Country: South Korea
Princess Songhwa (Shim Eun-Kyung) refuses her fate of marrying someone who matches her marital harmony. There are 4 men on her future husband list with different fate signs. Refusing her fate, she decides to leave the palace and find her husband by herself.
Seo Do-Yoon (Lee Seung-Gi) is a person who interprets marital harmony signs. He is very skilled at his craft and, consequently, selected as the one to read the marital harmony signs between Princess Songhwa and the 4 men on her husband list.
- Filming began September 9, 2015 and finished December 23, 2015 in Namyangju, Gyeonggi Province, South Korea.
- Teaser poster and 7 character posters for movie “Marital Harmony.”
- Lee Seung-Gi – Seo Do-Yoon
- Shim Eun-Kyung – Princess Songhwa
- Kim Sang-Kyung – King
- Yeon Woo-Jin – Yoon Shi-Kyung
- Kang Min-Hyuk – Kang Whi
- Choi Woo-Sik – Nam Chi-Ho
- Jo Bok-Rae – Gae-Shi