From a very quick search from the Korean Customs website:
Personal limit is $400, must be for personal use (not commercial.)
Anything after that, expect to be taxed heavily, also depending on what it is. Browsing through the site shows me that fragrances and furs are taxed at 30% lol
Personally, if it were me, I wouldn't take $10K worth of stuff to a country I'm visiting, even if I was headed somewhere after that. The potential headaches seem immense.
Edit: Found the English version of the site - not too useful, but still "official" info:
http://www.customs.go.kr/kcshome/mai...utMenuNo=21015
And a screenshot for the lulz: