Seongnam Mayor Lee Jae-Myung, who won some favourable international press for running a left wing campaign last Democratic Primary, won in Gyeonggi despite a public spat with an actress he had an affair with.
This probably is the end of An Cheol-soo's political career. Not a person I would vote for, but it would have been nice to have a more democratic Right in Korea.
Was he really on the right? I had the impression Ahn Cheol-soo was a centrist, even though his centrist party merged with a right-wing party to try to stay relevant (unsuccessfully, it seems; I agree with your assessment that his political career is over).