This isn't WWII, but it won't be the Gulf War either. They know our tricks, and we're going to have dig out a good number of those guns the old fashioned way. Certainly we can win, but it won't be as simple as picking up incoming fire on the Q36 counterbattery fire ballistic computer, and putting 155mm on the firer.
Don't underestimate the NK fear of our air power, or their application of lessons learned from the mistakes of others. Their bunkers are designed to resist precision munition strikes against weak entry points.
Also, we require a secure rear area to conduct a lot of our operations, which NK will sow with infiltrators, sabotuers, and SOF. The use of persistant chemical agents deep in theatre and non-persistant on frontline troops and weapons to create openings are also to be expected by doctrine.