I have not given the KRW much thought since buying Kumbi.
Trying to diversify from the US dollar seems like a worthwhile goal to me, as I suspect that the government will inflate the dollar to score political points with indebted voters. Cash seems like king right now, and I like that, but if the politicians begin printing it in great quantities, its value could be threatened.
Yeah ... unfortunately Kumbi went nowhere in KRW. But check out the exchange rate over the past few months. USD shot up from around 1000 to almost 1400 since late July, most of it in the past few weeks. I think it may be foreign gentlemen (us, for example) yanking their money out of Korea all at once.
There are probably other possible explanations, but that is one big, fast rate change.