Thoughts?
The first thing to be done is to wipe out the missile and howitzer brigades just north of the DMZ.
On the other hand, next provocation may be of different kind. High on the list of likely scenario is the infiltration by their special force inside S. Korea and carry out some serious sabotage operation. With no artillery sites or missile base to hit, the retaliation may not be directly reciprocal: NK could knock out some strategic target(not necessarily military,) and SK may have to retaliate by knocking out some NK's military installation, which is not a source of attack.