Life in North Korea is unimaginable for us. Any hint of disrespect or opposition to the regime results in incarceration for the whole family... something as simple as allowing the portrait of Dear Leader to get dusty for example. So grandparents, parents & children are imprisoned in appalling conditions.
We do not see anything about this on TV so it is all out of sight, out of mind. I am afraid that invasion of the South is not an empty threat.