there are a few boulders and a few more sport climbs at the top of the little mountain in hadan. you might be able to find directions on this site. i just do sport climbing these days so i can't help you with the bouldering
I think I know busan bouldering scene pretty well. even though I stopped climbing for few monthes. Many folks who boulder mainly in town looked like having their own plan for chuseok holidays. and tomorrow will rain south east part of korea. I may will go bouldering on sunday(50% 50%).
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