North Korea is one of the most ruthless regimes in the world. They rule by fear and brainwashing. These claims seem unbelievable, but it is all true. All you need to do is a google search on North Korea and you will read about one of the most evil leaderships in modern history. Let me address fear and then brainwashing.
First, they rule by fear. They brook no opposition. If anyone seeks to question the government, they put them into labor camps or kill them. This creates awesome fear among the citizens of North Korea and they are not able to do anything.
Second, the country cuts off all communication with the outside world. So, citizens are not able to know what is going on at all. They are completely brainwashed by government propaganda. They even think that their leaders are divine.