I guess neither. Not a single crypto investor will be interested in investing if they are being taxed this much. Obviously they are still able to trade if they really wanted to and it's not illegal, and trading p2p probably won't get taxed anyways since it's just a fair swap without involving any companies and the government has no way of knowing that a bitcoin exchange has happened. So if you really wanted to rate this news, i guess it's better than banning altogether.
With this new progression, i think we'll see some crypto volume go from Korea back to Japan, where it is already one of the Asia's biggest bitcoin hubs. With the South Korean government not supporting bitcoin, Japan, who legalized bitcoin last year, is going to be the safe haven for investors.
These high tax percentages are basically discouraging big investors from investing. South Korea just didn't want to ban it altogether, but rather be able to collect some revenue.