Yeah, one bottle is unfortunately the limit.
On a related note, does anyone know (for sure) the actual tax rate on alcohol over the limit (ie, more than one bottle)? I know it's high, and I know menschmachine said it's something like 80% of the value, but does anyone know for sure?
Also, nardthefox, have you checked the underground markets in Namdaemoon? There are stalls there that have all sorts of alcohol that I haven't seen anywhere else in Korea. One guy in particular had a pretty impressive assortment of scotch (again, for Korea).