Are you on base? There is a wall on base and one in the city and a gym in the city, so you can meet local climbers at these places. I'll be back in Korea Aug 22 (in Jeonju, just SE of Gunsan)-- there are quite a few climbers in our province who get out regularly. From Gunsan you're fairly close to Seonunsan, Halmae Bawi, Yongseo Falls, Daedunsan, Hagampo.
"If you can't do something well, you might as well learn to enjoy doing it poorly."
-- from a de-motivational poster, but I find it oddly liberating