Right now, on Korean exchange Korbit, the quoted price for BTC is 3,168,000 KRW, which translates to $2,823 USD.
On Coindesk, BTC is quoted at $2,318.
This site shows an even lower price of $2,222.
So, if one knew how, they could presuambly buy BTC for $2,318 on non-Korean exchanges and sell...