Chris Bowlby profiles the South Korean pop star Psy, sudden global star whose Gangnam Style has topped the UK singles charts, and whose video is the most popular video ever on Youtube. How has a Korean star swept the world, what lies behind his success, and why is he now selling fridges? And how has the world's most closed society, North Korea, responded to the global Gangnam craze?
Producer: Smita Patel.