I'm in korea doing Arb trading for about 6 months now and currently this week its at its best with 30% across all the coins.
Im a permanent resident here and have full verified accounts with coinone.co.kr and bitthumb - trust what many comments say its impossible for non-residents to withdraw fiat on Korean exchanges.
There are a number of tools we use to check prices here is a snapshot of the arb spread right now:
http://i65.tinypic.com/14tle6f.pngMoving Fiat out of South Korea sure has its limitations ( for individuals this is only 50,k USD) - BUT there are a number of ways I use via Corporations / exports. ( details i'm reluctant to go into publicly here for obvious reasons)
Peace x