What’s been done to the North Korean people since the 1940s under the Kims has been one of the great crimes against humanity imaginable.
Reintegration is going to be almost impossible since the people themselves are so different. The Southerners are living in a first-world culture, educated and well-nourished. The Northerners are impoverished, living in a gulag-state little better (and with less freedom) than those in the stone age, and are so malnourished, that has likely caused mental deficiencies and stymied their physical growth and stature. Just a horrible situation.
To cut through the beeswax, just refer to NK as the “kingdom” of North Korea. Fat boy is far closer to the tyrannical princes and kings of old, a “brutalitarian” who rules by force of arms, than to any other form of government.
This is also a sneer at the “People’s Republic of China”, whose communists should be justifiably ashamed of supporting a feudal system of government, by their own philosophy.