Why is North Korea still communist?

Korea remains under the control of the facially Communist regime of the Kim Dynasty because any possibility of reform is closely blocked and monitored by the Kims. Any attempt to introduce new ideas to Korea is met by stern repression and violence. There are concentration camps throughout the country where torture is inflicted on dissidents up to the point of death.

North Korea is not communist nor has it ever really been it is a Dictatorship directed by the state 'Juche' Ideology.