and by the frontline journalism fund with a grant from millicent bell through the millicent and eugene bell foundation. >> narrator: jiro ishimaru is a journalist trying to expose what kim jong un's regime wants to hide: the secret world of the north korean people. he has an undercover network which covertly films life inside the country. >> (translated): obviously, it's an extremely dangerous thing to do. in north korea, even filming everyday life is considered a form of political treason. if they are caught filming, they'd be locked up and may never be let out again. >> narrator: even filming on the chinese side of the border is illegal. >> narrator: the people who work for jiro smuggle their footage across the tumen river, which divides china from north korea. the north korean border guards have been known to shoot to kill. the border has become even more tightly controlled since kim jong un took over as supreme leader two years ago, the third ruler in the kim dynasty after his father and grandfather. he inherited the world's most isolated country, where the people have no internet