A major problem is that North Korea controls information so tightly that most of the population do not even know that there are any other countries in the world apart from South Korea ,Russia, China and the Great Satan USA. They are also told that their standard of living is the highest in the world , better than any other country and it is all due to the Dear Leader and his government.
There is no internet apart from a very small government controlled site, no TV , Radio or newspapers other than the official government ones. Tourists are limited to a group of 8 maximum and have to have two official guides with them at all times. They can only see what the guides allow them to see, and can only stay in the country 5 days. Tourists can not bring in mobile phones or computers, they are confiscated on arrival and not returned until the tourist is out of the country.
Until a few years ago a NK citizen could only make a phone call from a main post office and had to book the call a week in advance. The call would be monitored and recorded.