Japan already legalized the bitcoin and it will be a safe place, But about the south korean, the regulator better to think about the north korean as a threat to the country rather than try to waste a lot of their time to the crypto regulation, because south korean already threaten by the nuclear's country.
good point they will need to focus with their securities instead of wasting their time chasing the crypto's like what US and china did, I think we can say japan
would not be bother since theirs a lots of people who got better discipline in terms of investment and it wont hurt their economy I guess.