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theCrag.com is a free guide for rock climbing areas all over the world, collaboratively edited by keen rock climbers, boulderers and other nice folks.
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Climbing in South Korea is an awesome experience. There is rock everywhere, predominantly granite. The locals are amazing, too. Even if you have a language barrier, they are really accepting and you can usually figure it out with hand signals.
Crags can get pretty crowded on the weekend, especially around the Seoul area.
The locals tend to sandbag their ratings a little. Each group tends to have its own favorite spot; they have the routes wired pretty tight, so they can think a route is easier than it really is.