This problem isn’t confined to Korea of course with countries that are major trading partners with China like Brazil find they are a huge disadvantage. The renminbi has dropped 60% compared to the Brazilian real and it makes it very difficult for their manufactures to compete with China even in Brazil.
The World Bank is making no secret of their intention to create a new international currency backed by a large gold component. This would mean the end of the USD as the reserve currency of the world and this might be a good thing except that some people are pointing out that this could easily lead to the end of US sovereignty. The reason for this is that we are completely dependent on imports for our very existence and without the ability to create our own money we would become serfs to the people who do control the money. Currently we are at least peasants with some rights, serfs have none and without a sovereign currency we would only sink ever lower.