I think Korea will put taxes through crypto exchanges. So it means every Korean crypto exchange will required KYC and that will be the basis of Korean government because they can't put taxes to individual person because cryptocurrency is decentralized and government has no control on it. It means there is a transparency between the Korean government and to all crypto exchanges on their country.
Korea is one of the advanced countries, with top infrastructure, I do not doubt they will find a way to tax crypto traders in their country, but internet is a big place, some Koreans will find a way to stay under the greed and trade anonymously, or at least they will try doing that. In some countries people pay tax on crypto for years, and in some countries like mine is government is still far away from creating some crypto regulations, which I think is good for me, even when they come up with some rules I will try to stay anonymous as long as I can!