Why do children of North Korean defectors move back to North Korea?

https://www.quora.com/Why-do-children-of-North-Korean-defectors-move-back-to-North-Korea/answer/%E6%A1%91%E7%94%B0-%E5%81%A5%E5%8F%B8-Kuwata-Kenji?prompt_topic_bio=1

Because it is likely to realize North-South unification, he wants to return to the north early and get in a better position after unification.