When South korea and Japan officially legalize bitcoin, then I'm quite sure that the future of the bitcoin will be brilliant. This will be followed by other countries even later trade between countries will be using bitcoin.
Asian stock in 2017 only gain17% aproximately but the value of bitcoin was increase 124%. I think those two countries legalize bitcoin because a lot of their citizens invest in it. I am sure that more countries will accept bitcoin in the future. Especially Asian countries.