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Not sure of restrictions there to ie withdrawal of fiat (maybe to korean banks only?). But we have strong KR community on Steem so maybe they can answer.

Also keep in mind its BTC->KRW->USD

Wont work unless ideally you have a local bank a/c or you are a Korean national afaik. Since you are withdrawing into local currency.

I have neither. Damn, why cannot things be easier? :D

Same situation as when Indian exchanges were $200 higher than others. :D We'll just have to wait and watch.