Moon Sung-keun (born May 28, 1953) is a South Korean actor and politician. Moon was born in Tokyo, Japan, in 1953. His father was Rev. Moon Ik-hwan, who fought for democracy alongside Kim Dae-jung under the military regime led by Park Chung-hee in 1970s, and was a well-known pro-unification activist. After graduation from Sogang University with a bachelor’s degree in trading, Moon worked as a salary man for 8 years. 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. Moon made his film debut in 1990 with Black Republic directed by Park Kwang-su. He started his political activities in 2009, becoming Democratic United Party’s temporary chairman in 2012.