I will sincerely exclude China from the list you have mentioned. Any crypto enthusiasts know that China is not at all open to embrace cryptocurrencies within their economy. China is the first country to ban ICO (even though I support that), but later they kept on cracking the crypto market within their country. They imposed tariffs on the electricity for crypto mining firms. They are not at all crypto friendly.
However, I will agree with the other two as Japan is the first country in the world to legalize crypto currency and distributed licenses to open crypto exchanges on their soil. Now South Korea is following the footsteps of Japan.
China is dying(not really but still). I don't know what South Korea is trying to prove,like another user said, they were involved in FUD and bullshit, and now spending a 100 million $ on blockchain development is shady at the very least.
South Korea definitely won't become the World Bitcoin Special Zone, Japan has more chances for it, if the World Bitcoin Special Zone is even a thing. Honestly this doesn't even matter,right now.