Korea - UN or...?

[Olefin]

The first edition mentions North Korean troops in the US Army Guide

7th Infantry Division - engaged against mechanized elements of the North Korean Army - and then after the collapse of the Chinese front the division was surrounded by Soviet and North Korean forces and nearly annihilated

45th Infantry Division - division bore the brunt of numerous Soviet and North Korean counterattacks

4th Marine Division - entered combat against the North Korean Army

5th Marine Division - also talks about combat against the North Korean Army

Thus 1st edition - North Korean army units for sure

2nd edition says that North Korea and South Korea had been unified and that the US was in combat with Soviet units only

to quote "Korea: The newly reunified Republic of Korea came to the assistance of the Chinese early in the war and was subjected to limited
nuclear attacks by the Soviets. Although the capital at Seoul was destroyed and several ports were severely damaged (they are now devastated), most of the rest of the country is organized under martial law, and is an island
of stability in a sea of disorganization. Resuming its reputation as the "Hermit Kingdom,"Korea is now extremely xenophobic and distrustful
of strangers."

thus if you are looking at the 2nd edition there would be no North Korean units - however the American Combat Vehicle Handbook states the followign for the 45th Infantry

"Upon disintegration of the northern Chinese armies, the division bore
the brunt of numerous Soviet and North Korean counterattacks and became separated from the main body of VI Corps"

The 4th Marines also mentions North Koreans

Thus the question - is the V2.2. version incorrect that Korea is unified or is the American Vehicle Guide incorrect with North Koreans mentioned?

One of the two is wrong - unless somehow you either have renegade North Korean units that were formed in the Soviet Union prior to the war or had units of the unified Korean Army turn renegade and join the Soviets