Korea is available for product purchase only as is right now. There is no language translation and country-specific localization available, check the Availability Guide link on this site:
On the CustomerSource portal Korea is not listed for legislation and localizations:
mbs.microsoft.com/.../GFMLocalizationPortalMC
There is an e-mail address there though, where Microsoft could be directly contacted. Try to get through to them via your implementation partner and communicate your requirements for this area, see if you could find out more details through official channels.