Historically, Korean territory was not just limited to the Korean Peninsula. Two Korean kingdoms, the Goyuero and the Sillia, had territory that encompassed parts of modern day Manchuria with Sillia only occupied Liaoning and Goyuero occupying Jillin and Heilongjang along with Liaoning.
Today, some Korean nationalists claim that Korea, as a united country, should also encompass these provinces, though nobody takes these claims seriously. Even North Korea recognizes the provinces as sovereign Chinese territory, though it should be mentioned that the area bordering North Korea has a large Korean minority, though it is slowly being replaced by ethnic Chinese.
So with a POD of either just after the Korean War or during the 1960s when North Korea was going through a economic boom, create a scenario of what would've happened had North Korea somehow acquired these three provinces
Today, some Korean nationalists claim that Korea, as a united country, should also encompass these provinces, though nobody takes these claims seriously. Even North Korea recognizes the provinces as sovereign Chinese territory, though it should be mentioned that the area bordering North Korea has a large Korean minority, though it is slowly being replaced by ethnic Chinese.
So with a POD of either just after the Korean War or during the 1960s when North Korea was going through a economic boom, create a scenario of what would've happened had North Korea somehow acquired these three provinces