As I understand from the news, the law covers crypto assets acquired during marriage but does not mention assets acquired before marriage. Will they be divided upon divorce as well?
So who wants to marry a Korean woman after today? 
The west is not fair with the men and I'm not sure why they practice such system but perhaps they want to reduce divorce rate and so that men doesn't use women any how because of their vulnerability of feminine characters but at the same time, they should have also consider the men too, women can be manipulative and if she want to pretend, nothing on this life can save the man.
As for the Bitcoin, division but I think they are among the few countries that doesn't do crypto, even the north Korea are involved in crypto than them but because they are reported to be stealing crypto and hacking wallets, they don't have good reputation when it comes to crypto legality. By the way, why will you tell your partner that you have a Bitcoin when you have hidden it from them, it's better remain secret with you only to avoid things like this.