Let me preface my response by saying I am not an english teacher though I have recently met some english teachers who made me ashamed to have the same skin color as them (fortunately enough though not the same nationality :-) ... they were arrogant, ignorant, socially retarded and quite frankly could do with a good culling. ... and on with the rant ;-)
Life in Korea is vastly different ... and if you're not an adaptable, open-minded (and very tolerent) sport of person you may not like it (but you can just carry on like an igonrant arsehole and get by on Korean politeness if you want to).
Korean society is very heirarchical which takes some getting used to (for the most part foreigners seem to be exempt from the normal rules ... but if you're not gonna accept and embrace this country's way of life why the f**k are you coming here). Sure it is hard and sometimes I am personally very disinclined to accept some aspects of the culture, but it is their country and their culture and I chose to live amongst it, as long as you can come to grips with that it is no real dramas.
Climbing here, like everything really, is generally crowded (a big change for me ... I used to climb to get away from people ... hahahahaha). can't say I've been too many places but what I have done was good.
My thoughts are like this ... coming to Korea ?? Learn Korean. It is not that hard, maybe as a full time worker it will take more time, but if you make a point of avoiding english speaking foreigners you'll pick it up a LOT faster. Koreans generally appreciate that you try and speak Korean (though it is an unforgiving language when it comes to mispronunciation) and in a lot of situations (regardless of how many times a stupid person may repeat him or herself at ever increasing volumes) a Korean might(shock horror, my god how does something like this happen!) not speak english.
So yeah there it is in a nutshell (from my perspective) Korea is different but great, a challenge at times, but come here with a humble attitude, realise your country/culture is not the be all and end all and just generally don't be a ******** and I'll like you a lot more :-) (Koreans might as well :-).
My 2 cents (can ya tell I am a little purturbed just at the minute? ;-)
P.S. my ankle is the size of a cricket ball at the moment so Ganny on thurs is looking dodgy.
P.P.S. no offence was intended to any elglish teachers here ... just those few who came to our uni lecture series on Korean history and culture and asked (among other, ignorant and arrogant questions) why Koreans are so bad at english ... WTF?!?!?!?!?