Well, actually I'm not very good at writing introductions. In short, I'll summarize it in one sentence: Snape was reborn after death. He originally wanted to stay away from right and wrong, but in the end he was stuck by a few super sticky human-shaped glues and could no longer escape.
Next, we will introduce the characteristics of several protagonists:
Professor Snape: A greasy old bat who is awkward and venomous.
Lucius: The arrogant and elegant platinum prince, but he immediately turned into a rogue when he met Snape.
Sirius: Impulsive and a bit childlike, the evidence is that he expresses his love like a child and bullies him if he likes him.
Lupine: Gentle and sinister, a typical Slytherin in lion skin.