The first thing to be done is to wipe out the missile and howitzer brigades just north of the DMZ.
Correct imho, the artillery within range of Seoul -much of which is on rails that rapidly run the gun back into a cave immediately after firing- is THE primary threat of the North Korean Army
The AF and Navy are nothing compared to our side, they’re all a land army. They have a lot of AA and set artillery pieces... like 40-50K I believe. The plan would be to level Seoul the first day and try and force a negotiation