"North Korea’s founder (the current leader’s grandfather) Kim Il-Sung once proposed a Koryo Federation comprising two independent Korean states that respected each other’s choice of political systems"..Un is not like his grandfather but if the people behind him can be convinced we may see some movement on the North' position. 
Keeping the fingers crossed that we don't escalate any more.
The history in this country (North and South) is filled with political upheaval and violence, and intervention/occupation by  China and Japan.