Chon Hae Song, vice-minister of Unification;
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The South Koreans have to know that the North would only agree to unification under the Kim regime.
Make Kim supreme leader but a figurehead position with a ten year term limit. Moon can be Prime Minister. Give the South Korean legislature the real power.
The hard part of reunification is they have to merge realities. During his term figurehead Kim can work to get the north up to the south's standard of living and become a hero doing it.