While I have not yet visited North Korea personally, Jayant Bhandari has done so and shares his insider account of the situation he encountered.
I have always wondered why there are no assassination attempts on the Kims like there have been on Adolf Hitler and Benito Mussolini. Now I have a better understanding why.
This 15 min video is well worth your time:
Provided the facts he states are correct - and I have no reason to doubt that - I completely agree with his assessment and conclusion.