DPRK Unified Korea

How can the Communist Block win control over all of Korea without initiating WW3, and what would be the ramifications?

I assume much more emphasis on the domino theory.
 
They can over-run the Pusan perimeter in August of 1950 and push the U.N. out of Korea. DPRK forces need to act fast, before the Inchon landings, to have any hope of success.
 
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