North Korea is a case of genocide

genocide: 
the deliberate and systematic extermination of a national, racial, political, or cultural group.

Here is an article dating back to 2012 and written by Robert Park, a human rights activist.

He did a really dumb thing back in 2009 by entering North Korea and protesting about the genocide that is ongoing there.
He was imprisoned, tortured and sexually abused and hasn't fully recovered since.

The case for genocide being committed in North Korea against the so-called hostile class, Christians, disabled, etc is valid.

http://www.koreaherald.com/view.php?ud=20120208000741

Here is an article from the Washington Post about Parks effects of his detainment in North Korea.

https://www.washingtonpost.com/world/ex-prisoner-cant-pull-his-mind-away-from-north-korea/2014/01/31/9417cdd4-8ab5-11e3-833c-33098f9e5267_story.html?utm_term=.5d2e0298daf5