If you are not Korean then you cannot sign up for Korean exchange. Recently they passed rules which do not allow non citizens to trade on Korean based exchanges. The OP is looking for someone which an exchange account willing to sell to him to split the arbitrage. I have seen this split as large as 20% between Youbit etc and Coinbase/GDAX. The plan is to split the difference minus fees. At least I assume that is what the OP is looking for.
I think its better that way because the moment they open to everyone, it would have been infested with a lot of people looking to take money of the economy and the arbitrage would have been eroded. But come to think of it, I think the Korean market are trying to isolate the crypto market to and establish their dominance in the industry because setting an arbitrage to have been high as that, it means that price can only move towards that direction and not lower which is indirectly controlling the price and that is what I will agree when its being referred to as whales.
