Bruce, you'll have a buffet of keen and passionate climbers when you arrive! Ice is out almost already. It is getting warmer as we speak. I know of at least 30 people who make it out to climb every weekend, albeit scattered over the country. My boyfriend lives in Seoul and he (we) is (are) always looking for other partners! Bring your rock rack.
you can catch another glimse of climbing in Korea on my blog.