In 1985, he began acting in theater, and became a key figure in the beginning of the renaissance of Daehangno stage plays in the mid-1980s, playing the leading role in such mega-hits as Chilsu and Mansu and Till the End of Time.[2] Moon made his film debut in 1990 with Black Republic directed by Park Kwang-su.[3]
Moon started his political activities in 2009, becoming Democratic United Party's temporary chairman in 2012.[4][5][6][7][8][9] Since then, he has mostly made special appearances in movies.
In 2017, Moon and a group of South Korean artists filed complaints against two former presidents Lee Myung-bak, Park Geun-hye, and other six senior officials, asking for a prosecution investigation over the allegation of an "artist blacklist."[10]
Moon is a frequent collaborator of director Lee Chang-dong. He has starred in four of Lee's films, including critically acclaimed Burning (2018).[11]
^Kim Ga-young (June 30, 2021). 우수무당 가두심' 문성근X윤석화X배해선 합류…김새론X남다름 호흡 [Outstanding shaman street-shim' Moon Seong-geun X Yoon Seok-hwa X Bae Hae-sun joins... Kim Sae-ron X Nam Da-reum acting]. Edaily [ko] (in Korean). Naver. Retrieved June 30, 2021.
^Yoo Jung-min (May 25, 2022). '인사이더' 서로 다른 목적의 플레이어들…단체 포스터 공개 ['Insider' players for different purposes... group poster release] (in Korean). MBC Entertainment. Retrieved June 7, 2022 – via Naver.
^Jang Ah-reum (August 4, 2022). 멘탈코치 제갈길' 정우·이유미·권율·박세영, 긍정 에너지 넘친 첫 리딩 [N컷] [Mental Coach Je Gal-gil' Jung Woo, Lee Yu-mi, Kwon Yul, Park Se-young, the first reading full of positive energy [N cut]] (in Korean). News1. Retrieved August 4, 2022 – via Naver.
^Kang Min-kyung (October 29, 2021). 디즈니+ '무빙', 류승룡X한효주X조인성..★들의 대잔치 '韓 액션 히어로 [Disney+ 'Moving', Ryoo Seung-ryong X Han Hyo-joo X Jo In-seong..★'s 'Korean Action Hero] (in Korean). Star News. Retrieved October 29, 2021 – via Naver.