that's Not bad at all because South Korea now is becoming one of the safe haven of Bitcoin and Cryptocurrency so for me this is reasonable because it is becoming one of the profiteering from Koreans and Government must collect what they think is appropriate and related to their taxes.
and Knowing Koreans?they will surely accept this in return of protection from scammers and other Bad elements that may target their funds in any cases.
and also Korean's known to be one of the best Tax payers in the World thats why their country is continuing to Bloom.