For Korea – KS C IEC 62368-1 2ndEd. seems to be on track for a Q1 2019 publication. Korean Agency for Technology and Standards (KATS) would be responsible for this. It is unclear at this time when the standard will be mandatory.
For Japan – JIS C 62368-1 is still in process of being adopted as the formal technical requirements under DEN-AN law. We can estimate later this year (Q4 2018?) the process will be complete. It is unclear at this time when the standard will become mandatory.