Ambassador: Japan Airlines
Join Date: Mar 2008
Location: LAX
Programs: JAL Mileage Bank, JMB Diamond, oneworld Emerald, Bonvoy Platinum
Posts: 16,394
JMB miles on KE flights on/after Dec 20 2018
https://www.jal.co.jp/en/jmb/earn/travel/flight/ke.html
Not sure if it only applies to only flights between Japan-Korea though as it specifically lists "Flights between Japan and Korea are eligible for mileage accrual."