here: http://forums.cnet.com/7723-6616_102-607459/hosting-a-multi-location-website/

But to expand a little, you could get away with hosting your site in the U.S. and then utilize a CDN that has locations in Korea to serve stylesheets, images, and multimedia. That way, the bulk of the content would be served locally, which will significantly increase your website's speed, but your core files are still on a server in the U.S.

~Sovereign