#2 - Sept. 16, 2010, 4:30 a.m.
Purchasing a copy of the game for the region of Korea should result in a Korean-language game - I do not believe we currently offer an English version of the game that would allow you access to the Korean servers.
If you are a native English speaker, but you are concerned about latency, I might suggest purchasing the South East Asia version of the game that provides support to Australia and New Zealand. Otherwise, purchasing the North American version should be your best bet.
There is a point I am unsure of, however, and that is whether or not it is possible to play another region's game specifically from Korea. There are some special rules regarding that. Unfortunately, there is no one here for me to ask this evening to clarify this. I can check back into this thread tomorrow once I have an opportunity to speak with those who are more in the know.
I hope that helps. =)