Yep, It’s in the North Korean Constitution that only a direct descendant of the Kim family can rule.
Apparently, that is why the half-brother was assassinated - the Chinese were going to kill Kim Jong Un, to use the other guy as a more amenable puppet.
This is riveting TV. Flipping through all the major channels and no one has any idea what is going on!
I did not know that. Now that's what I call job security.
That is, unless you're a close family member of the current ruler.