First of all, if you are not South Korea citizen, there no legal way to play in any NCKorea PC game.
Also, you should use Korean language (Hangul) to sending tickets to NC’s support team or talk with Korean players in the chat. For example, the macro system in L2 based on Hangul as well, so there’s no /target, but /타겟.
Here more. All payments (in L2sotre as well) can be processed with domestic Korean banks or services only. So no global VISA or MasterCard, no PayPal and etc. Last, but not least. The PING! Just imagine an online game with 200 ping. For PvE it can be ok, but in PvP anyone with 2-50 ping won’t give you a chance.
I personally play with accounts of my Korean friends. I can’t recommend any guide or service because I do not use them.