I hope the 2nd puts up a good fight but I think they'll be overwhelmed. They're there as a tripwire to allow time to organize the main battle line of the ROK Army between them and Seoul.
They could be facing 30 or 40 enemy divisions and are in a narrow corridor from the border to about 25 miles South of it.
Seoul is only like 50 miles from the border, we are there to fight a delaying action
The scenario plays out pretty much as stated but those will be ROK Army tanks doing the killing as ours will be sacrificed to give them time for the thing to play out.
Just my opinion, but I was with 2nd D HQ Company about 38 years ago and that was what our officers pretty much told us our mission was.