To everyone saying that Steam in Korea is not big:
You're wrong. I went there recently and in the top 10 charts after StarCraft (which is undoubtedly is #1)? Counter-Strike, Team Fortress 2 and Left 4 Dead 2.
All you may hear about Korea is MMOs and StarCraft, but there is definitely a strong market for Valve games. I had the pleasure of playing TF2 over there, and the players are pretty damn good, and this is just from pubbing.
So please, at least have some experience before you comment. Because that's just insulting to a nation whose population is far better than the media says.