Humans have two kinds of sins - original sin and fundamental sin. Original sin is the sinful nature and evil roots left over from the sin of the ancestors, and fundamental sin is the sin committed by each person in this life.
He was an angel of light, but he wanted to fall into darkness. ——This is the crime.
Blindly believing in greed and asking for the devil's love - this is the original sin.
This article is just for entertainment and has no basis. Regarding the background and geographical features of the heaven and demon world, I refer to "The Right Wing of the God", but I will not plagiarize.