This is a question I CAN answer! Im Korean American and came to the states after I finished 6th grade in Korea.
Basically, we were taught that we have families and friends in NK and its their government that needs to be taken down. Annually, we had to draw or write wishes of becoming united Korea again and was given award for making the best writing or drawing in school. We were also taught not to waste food because NK "kkotjaebi" (orphaned homeless kids who eat off spilled foods on the market grounds) does not have the luxury to eat what we eat. We were also taught that we have to alert the police of military of any suspicious individuals who may be the NK spies.
My grandparents are from Kaesong before Korean conflict happened and majority of their family are in NK. We don't know if any of them is alive or well, but just hope that one day we get to see them.
Please mind the grammar
I will stick around to answer any Qs!!