Why does China not want to lose control of NK?
Compound reasons.
NK is a human organ farm run by the Chinese government.
NK citizens are rounded up like cattle and placed into the Chinese prison system as political prisoners and held in custody
until their organs are harvested "fresh"
on a as needed basis.
This doc. only scrapes the surface of the organ trade out of China.
https:// en.wikipedia.org/wiki/Human_Harvest_(film)
NK is the human cattle ranch.
China is the processing plant.