Unfortunately, Google hasn't driven through Seoul, it seems. What's more, I can't even seem to find the address listed on NCSoft for the corporate address: 158-16 NCSOFT R&D Center B/D, Samsung-dong, Gangnam-gu, Seoul, South Korea (ZIP 135-090) in Google maps.
If anyone knows of a native Korean online mapping service that might have more info perhaps we could find something, but Google wasn't of much use.