GMS in k(h)orea

I'm not exactly sure what your problem is. You should be able to go on GMS and when you try to login, it'll give you a 'Please play xxx, not global' message (at least it does for europe).
Basically, you do what was listed before and you're connected to the internet under an American IP. You minimize AOL and open Global normally.

Connection options is the button circled.