Supreme Leader of North Korea had not been seen in public for a number of weeks, setting off a global frenzy regarding his whereabouts and health.
Speculation was rife as to who would succeed him.
The most likely candidate is his closest confidant. A young woman whose always by his side.
Becky Milligan pieces together the mystery of Kim Yo-jong. Politician and sister of Kim Jong-un.
Producer Smita Patel
Researcher Darin Graham
Editor Ravin Sampat