South Korea is a big country so it will certainly be good if South Korea opens the door to cryptocurrency. Surely this will attract more investors and also fans of cryptocurrency. Hopefully other countries will follow in the footsteps of South Korea. And bitcoin is made a legal payment. I hope that happens in the future.
It's been a while and still there's no impact yet with the current market, though you are correct this country is already considered as a well developed country and if more countries will follow the step that they've take and fully adopt this system, it will bring a huge growth as more people will used this
chain and it will be more usable imagine just bringing your device with your safe wallet and transact anywhere in the world who cater crypto payments.