North Korean leader Kim Jong Un is regarded as one of the world's most repressive leaders. Despite his high-profile career, there is relatively little known about the reclusive 39-year-old. Between fear of nuclear annihilation, brinkmanship, and ongoing tensions with South Korea and the US, Kim has kept a firm hold on North Korea, with his people given very few freedoms. But despite all this, relatively little is known of Kim, though a 2019 book called "The Great Successor" does give some tantalising details of his childhood. Here's what we know about Kim, and how he became one of the world's most intimidating dictators.

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