Hmmm. If he bites it (or already has), who takes his place? Is there an established line of succession, or will there be a battle for the throne?
His sister Kim Yo-jong is next in line. Like Rocket Boy she was educated in Switzerland.
She is First Deputy Director of the Propaganda and Agitation Department and travels with her brother on all his important trips.
https://en.m.wikipedia.org/wiki/Kim_Yo-jong