It's one of the most closed and repressive societies on earth. Its ruthless young leader Kim Jong-un has threatened nuclear war against America and recently executed his own uncle. Yet in the heart of North Korea's absolute dictatorship, a remarkable university - paid for by the west - is attempting to open the minds of the secretive state's future elite. Panorama has gained unprecedented access to this most unusual of academic institutions, where foreign lecturers teach the sons of some of the most powerful men in North Korea. Reporter Chris Rogers lives with the students on campus and asks: can the class of 2014 help to bring the hermit nation in from the cold?