Well the gene pool of the south Koreans and the north Koreans are the same but the north Koreans are 1 to 3 inches shorter on average because of famine while the leaders have round faces, makes sense.
The leader Kim Jong-un studied in Europe like many dictators (however, his grades and attendance rating are reported to have been poor) so he clearly realizes what he is doing to his people. Technically he is not even the real leader because the deceased grandfather Kim Il-sung is the Eternal President of the Republic, go figure.
North Korea is one of the world's most militarized countries, with a total of 9,495,000 active, reserve, and paramilitary personnel. Its active duty army of 1.21 million is the 4th largest in the world, after China, the U.S., and India. Not the best equipped but wars are never easy especially with large numbers.
I feel sad for the enslaved people and resentment for those who have supported the leaders of that inhuman state. It's the duty of every country on earth do their part in fixing this situation, preferably non violently but I'm not that hopeful.