which is the bigger threat, conventional war, nuclear war or this cyber war? >> cyber war. >> translator: the purpose of the cyber war is to enable the ability to fight. if the cyber war continues, there's a high possibility it could lead to a conventional war. in a country that claims to be the most wired in the world, south korea has been under increasing attack. just last month a major cyber assault knocked south korean television networks offline and throws business at banks. that's why seoul is building a cyber army. these are the soldiers learning to break code and understand what they call north korean cyber terrorism. we can't show you their faces because many of them will eventually work with the south korean milton the cyber front lines where they'll face off with cyber soldiers from the north. as amusing as this is, there is growing concern among security experts in seoul that because this was so successful and so funny that north korea may