Why do domestic strongmen rarely let their children move to North Korea?

In fact, almost no Korean, strong or weak, would think of moving their children to North China. This is because:

1. North Korea is not an immigrant country. Except in special circumstances, foreigners are not accepted for naturalization, nor are they allowed to live permanently.

2. The living conditions, customs and social atmosphere in the north of China are not suitable for the life of most Koreans.