 Since the country needs some type of income, and they avoid trade with the rest of the world, it's believed that they make money through fraudulent transactions such as drug trafficking and arms smuggling. The North Korean government will never admit that this is happening, of course, and they will never admit that Bureau 39 even exists. Nobody knows where the place is located, but they do say that there is a printing press capable of printing counterfeit U.S. money.