There was just a story about a group of surrendering Russian soldiers getting shelled by Russian artillery. It isn’t 100% clear that it was intentional, but its hard to not envision it as a throwback to the Soviet penal legions of old.
I’m sure by now they have figured out (or rediscovered, more likely) tactics to minimize the risk of their conscripts folding, sadly.
I think DPRK’s hope is that at least some soldiers and officers will return with some modern combat experience, something that their military organization is dreadfully lacking. It could end up being a bigger problem down the road for ROK even if they lose a few thousand bodies.