UN Forces cut off the KPA retreat in 1950

Historically UN forces tried to take back Seoul in 1950 after the Incheon landings, allowing the KPA to retreat north and avoid encirclement, and eventually linked up with the "volunteer" force Mao sent into the war.

Can the UN cut off the retreat and destroy the North Korean Army? What effect does this have on PRC actions? They shouldered most of the war effort OTL, but can they take on the entire war effort this time around, where does the line separating the two Koreas end up, and are there two Koreas? Just how decisive is it?
 
A portion were unable to retreat. They faded into the general population & the South Korean Army and Police forces spent four pus years suppressing the gurellia war the stay behind force started. More trapped NKPA men means more disperse to be hunted down and screened out of the general population. There would certainly be a similar underground resistance north of the 38th Paralle as well. This could drag on for years.

Also 25 to 35 % of the NKPA was on the east side of the central mountain range and could not be cut off by action around Seoul. Another 15 to 20% were already north of Seoul & would not be cut off.

OTL the NKPA Army was a broken force after October 1950. It was gradually rebuilt, but the trained cadres were thin and morale low. For the remainder of 1950 & into 1951 it was largely irrelevant. One of the second tier considerations of the Chinese in 1953 was the NKPA had recovered and was able to stand alone again.
 
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