Kim Jong Un, the world's youngest dictator, rules the planet's most secret and repressive state. But thanks to the digital revolution, he can no longer keep other nations from seeing the reality of day-to-day existence in North Korea - or stop his own people discovering that everything they have been told about life outside its borders is questionable. Dispatches follows Japanese undercover journalist Jiro Ishimaru on his latest trip to the country's border with China, where he secretly meets one of his trained agents, who is armed with the latest revealing footage.