It’s alluded that the son grew up in the west and not under the care of the parents from the first story, and that is how he became as rebellious and bad as he is now. The king says in one part he regretted not being more involved in his upbringing bc and that he turned out a disappointment because he grew up in the west. It’s never really mentioned why he grew up in the west tho

I don’t want to read this… ughh.. all I want to know is what happen to Shen Yu how did his son become like this? Please anyone give me spoiler