Very mixed feelings about this novel. Not really sure why the author later slowed the MC cultivation speed. Also, when too many women become involved with MC it turns the story stupid.
How can the system know if a person reincarnated, but can't see when a soul possesses another body? The story is definitely full of holes like @Grasshopper said.
Extremely slow for a system novel. How the f**k are his disciples surpassing the MC by so much when he has a system? One can argue reincarnation, but what is reincarnation in the face of a walking cheat?