This. Which is why I wondered what rules they have to even be out of the country. You can’t get in or out. It’s like a horror movie.
I'm pretty sure they have security guards that monitor the movements of anyone who lives outside of North Korea. I know they have some restaurants in other parts of the world, as some other businesses (like logging in Russia). In those instances, I think there are security guards whose only responsibility is to make sure that the people 1) don't run away, and 2) go from their living space to their work and back.
The other thing that they do, is that if someone defects, they then imprison your family. I think they do this for their diplomats. The diplomat lives in the country they are working in, but the rest of the family stays in North Korea.