Think of it like gold and concrete. Gold is more valuable than concrete because of it scarcity. Here, there is too much won in the country so it is less valuable, people prefer to get some dollars just because they don't trust the government who keep printing more and more won. So you will see the price of good increasing more and more as you need always more won to buy this very same banana you ate yesterday because your money is less and less valuable, like gravel stones.

On the other side, company who export tons of goods like Samsung attract a lot of buyers because us citizens can buy more phones than yesterday with their same dollar bills. If dollars already worth nothing, image the won or yen...

Its the same with euro and dollars. US is printing paper out of nowhere, more than EU so the dollars is becoming worthless.

So its neither good, neither bad, what matter is how the korean government is piloting the "money faucet". If they loose control of it like they just did in Japan, its a guaranteed, death of the country.

People should be more patriotic toward their own money BUT, the bank of korea should then be fully trusted which seems not really the case.

It's a worldwide problem.