So if you buy bitcoin outside of South Korea sell it inside...

So if you buy bitcoin outside of South Korea sell it inside south korea you make an arbitrage profit but th eonly way to get your money out of south korea is to turn it into an altcoin and sell the altcoin for Bitcoin in another market meantime enough other people have done the same so that you can only sell the altcoin outside of south korea at a loss .
bit pointless I would of thought