Not sure about a PoD, but one ramification would be, assuming Korea remains divided, the North does even better than it did in what would be the post war. Despite being bombed to hell during the Korean War, the North still did better in terms of economic growth compared to the South. Without that immense destruction, the North could probably be softer, more or less to a degree. Also, there's not so much strength in claims of American imperialism without a war (of course, dependent on whether American troops would still be stationed in the South without a war).
With a set of realistic changes due to no Korean War, North Korea could be more open to economic reforms like China or just as susceptible to the isolationism of OTL. The South could also do much better, as they were in a similar situation of destruction.
I don't think you can get rid of a Korean War of some sort altogether, just as we know it. The Kims are definitely the ones you'd need to take out. Now that I think of it a good PoD would be having Beria pick a homegrown Korean Communist instead of a Stalin-esque outsider to the Korean Communist movement.