Exchanges in south korea won't let everyone to make an account there. You can try if you have an account in both exchanges but in most cases arbitrage does not stay for long and before your coins are deposited and confirmed, the opportunity is already gone.
Users can search for information about which countries are prohibited from using the trading platform before they create an account in the terms and conditions of the platform. I don't like arbitrage trading although I see an opportunity to make a profit. Confirmation time will be one of the bottlenecks during arbitrage, when the network is busy then I believe you will miss the opportunity to sell it at the best price. I am also not used to doing KYC on many trading platforms because I want to keep my personal data confidential and secure. Some exchange may still be trustworthy because of their reputation, but we still have to weigh the risks.