@Yue Shaolan as for the parents, probably because as MC said, this guy that he possessed is a random character, and he said that he hates how he gets all dizzy and uncomfortable whenever he uses the book of truth, since the guy he possessed isn't even part of the major characters, he probably thought that it's not worth the side-effects nor any need to rush to find out and decided to use a method that wouldn't inconvenience him and used money for comfort of the procedure