A decade ago, BBC journalist Danny Vincent documented a North Korean family’s 3,000-kilometre journey to freedom. If caught, they faced almost certain death. They risked all to reunited with their loved one in the South. Today the number of North Korean defectors escaping the country has dropped dramatically. Escapees speak of increased ideological control and a shoot to kill policy at the border. Ten years on we go back to meet the Park family as they retell the story of their daring escape