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Korea is used to red candles. Their currency devalued by 50% overnight in the '98 asia currency crisis:

The USD will probably have an event like this in the near future where they devalue the dollar vs gold by an astronomical amount overnight. #physicalsilverbitchez
Arbitrage opportunities in South Korea are too much, as we can understand from the graph, we can open accounts from the South Korean stock exchanges.
Of course each country has the conditions of stock exchange, maybe Arbitrage is not possible.