Moon Jae-in's wife Kim Jung-sook waves after casting her vote on Tuesday.

Korea has a new first lady in Moon Jae-in's wife Kim Jung-sook after over four years without a first consort because the previous president, Park Geun-hye, was single.

Kim was born in Seoul in 1954 and studied singing at Kyunghee University, the same alma mater as her later husband. They married in 1981.

She was active on her husband's behalf during the campaign, often drumming up support in separate venues from Moon, and traveling to the liberal stronghold of South Jeolla Province once a week since last autumn.

The couple have a son and a daughter. Moon has admitted that he is not the talkative and expressive type when it comes to his family life. His son, Jun-yong (35), majored in design at Konkuk University and received a master's degree from Parsons School of Design in New York. He currently works as a freelance designer.

Moon Jun-yong played an active role in supporting his father in the previous presidential election but stayed out of the spotlight this time amid allegations that his father wrangled him a cushy job at the Korea Employment Information Service. He married in 2014.

Moon's daughter Da-hye (34) quit work after having a child in 2010 and has been a housewife since then. She also kept out of the spotlight during this campaign but made a video that was shown at rally in Gwanghwamun Plaza on the eve of election.

Moon has remained mostly tight-lipped about his family, and aides say he would prefer to keep them out of the glare of publicity.