Kim's most successful season on the Japan Golf Tour was his first, 2010. He was joint runner-up in the ANA Open and lost a playoff for the Casio World Open, finishing the season 11th in the tour money list. Kim qualified for the 2011 U.S. Open through sectional qualifying in Japan and finished tied for 30th place. He was a runner-up in the 2011 Asia-Pacific Panasonic Open and was 18th in the money list, after including his U.S. Open prize money. Kim dropped to 20th in the money list in 2012 and was out of the top 50 from 2013 to 2015.