My fear is that a mini sub delivers a bomb to Inchon. I don't believe that the DPRK could deliver a bomb via a plane or missile (too large of a device), so that leaves either a ship/sub or truck.
A hit on Incheon (costal) would screw up the Seoul Airport, International shipping, Refining, Power Generation, part of Seoul's mass transit system, and given prevailing winds would place in danger the lives of at least 3 million people.
I am not sure if a mini sub could work its way up the Han river, but if Seoul gets hit, that is how I would expect the DPRK to do it. A hit on the Gangnam district (yes the one mentioned in the song) would cut out the heart of the city. Seoul averages about 45,000 people per square mile so causalities would be enormous.
As far as tunnels I could see an underground nuke being used to disrupt the border defenses, but it would be really hard to dig far enough for an underground fission device to cause a huge amount of damage to Seoul.
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