With a POD after September 2, 1945, have the Korean War end with a unified Communist Korea while the Vietnam War ends with the North-South division of Vietnam more or less maintained. Bonus points if said unified Communist Korea adopts PRC-esque economic reforms (like Vietnam IOTL) while North Vietnam becomes a batshit insane "communist" dictatorship which often flings missiles about and threathens it's neighbors with war and South Vietnam is a thriving democracy, albeit a corrupt one.