They probably give you enough to not totally starve quickly but any luxury like maybe fresh food or say a favorite tea would mean finding some way to pay. Just guessing.
I am guessing most people are growing produce and keeping chickens etc if they can. Not see easy if you live in a massive, brutalist apartment block. Probably better eating in the country but more risk of freezing in the winter. All in all, I think I'll put off my plan to relocate there.
Most interviews with escaped North Koreans state the opposite. They are expected to be very self reliant while not having much to begin with. Farmers typically get most of their grain taken away with no compensation and have to survive by foraging, etc.