The first thing to show them is the wikipedia article on north korea media coverage.

It should cause a bit of a cognitive dissonance.

https://en.m.wikipedia.org/wiki/Disinformation_in_media_coverage_of_North_Korea

Here, I even went fishing for the link to help.

Then, there are a lot of tourists who took pictures of north Korea and brought them back.

They are telling.

https://www.ericlafforgue.com/gallery/Countries/North%20Korea

I particularly like eric lafforgue because he took illegal pictures and was simply banned, destroying the myth of getting killed/maimed/whatevered from disrespecting the rules.

The last step is to show theses articlea from what happens daily in South Korea, which most people think is an actual country and not an american subsidiary.

https://en.m.wikipedia.org/wiki/Poverty_in_South_Korea

https://en.m.wikipedia.org/wiki/Economic_inequality_in_South_Korea

And then compare Chaebols with the Kims

https://en.m.wikipedia.org/wiki/Chaebol

The conclusion after that is that both Korea are under duress, for completly different reasons.

One is limited in ressources and isolated, with a lot of poweful enemies and few allies.

The other is a feodal state controlled by corporatism and outside interests....