I don't know if this is too late, but here's some information. Unless you are going to purchase a Macbook in person in Korea, it is pretty much impossible to buy a computer in Korea, while in another country.
The is no keyboard option in South Korea, they all come with a Korean/English keyboard. Online, or at the store.
I have a Korean/English keyboard on my Macbook Pro, but the keyboard was purchased in Korea as a part, and then I installed it myself.