I bet the Army is re-thinking its new policy on allowing Command Sponsored in Area 1 now.
The past South Korean President Park Chung Hee initiated a policy that no new construction could take place north of the Hann River. This was to take more of the population out of the range of the NK artillery. This worked well for several years, till after he was killed. The leadership after him allowed new construction north of the Hann, and well north of Camp Casey. The area north of Seoul is in easy range of artillery, and will be heavily damaged in the initial attack by artillery and ground forces before being pushed out.
I do not think that the Nut Case in the north will try to initiate any major move south, because he knows it will be the end of his regime, but as nuts as he is, I would not want to bet either way.
Was stationed in Korea 1960-61, 69-70, 78-79, 81-82.