Fine if they want to take back some control over cashing to fiat, but 24% is way too much in my opinion.
It's in line with the existing tax policy, so I think it's hard to disagree with.
If undertaxed, people will see it as a sign that the government is very lax about it. If overtaxed, people will think the government is too strict, etc.
Crypto is in its literal infant stages in Korea, so I can see why the govt would want to do this in the beginning, and the lower or raise the tax rates according to public response.
If It's in line with the existing tax policy, then I think the current tax is too high.