But Seriously, in the first 24 hours of a War, The North would Destroy Seoul.
Then The South would Destroy The North.
Pretty much trashed already, except for the Pyonyang palace grounds. After the DPRK gets smoked and lil' Kim is hanging from a street lamp, the biggest challenge will be feeding what's left of the NORK population, assuming Big Red doesn't cross the Yalu again to save the day, for old times sake.