I believe Korea will not ban cryptocurrency, like China they just want to regulate it. We all know that majority of altcoins are shitcoins and we cannot deny that. If you are a leader of a country, you have to protect your people from scam to happen.
Do you really think the governments care about this? They only care about tax, just like the goverments care about our healthcare when they approve selling legal drugs (tobacco industry) so they gain more tax income? It's only because they want to get tax out of it and they see their own money system going down thanks to crypto.
South Korea will not ban it, because then they will lose economic power to Japan and other Asian countries who adpot cryptos, countries who will ban it, will face huge losses in the end, that is another good thing about cryptocurrency.