You could have just said, "I don't know".
Anyone who has paid any attention to Korea over the past few decades has at least a general idea of how NK operates so telling me SK Ingelligence folks do too isn't really saying much of anything.
Well this is not an issue just between Trump and Kim Jong Un. North Korea has partners. Please don’t kid yourself into thinking that China and Russia want peace for peace’s sake. They are going to make sure their interests are secure and are in no way interested in giving Trump a free hand in assistance.
And the other component is the political divisions *inside* South Korea over what reunification should like and on what terms it should come about.
The most unpredictable elephant in the room is North Korea itself. Not Kim Jong Un, but the quiet resistance building against his rule within his own country and in some segments of the elite population as well.