Transmigrated into a Book as the Villainous Empress's Lackey, and Master's Persona Collapsed

[Transmigrated into a book + Villain + Empress + Master + Madam and daughter with Wei Wu's legacy] After transmigrating into a fantasy world, he becomes the favored minister and sidekick of the villainous Empress Wu Yixian. Xu Changsheng thinks: What a sweet deal! I'll do the dirty work, and the Empress can take the blame! But then Xu Changsheng realizes he's entered the world of a book… "What?" "My junior brother Gu Haoran is the chosen protagonist, and I'm a disposable villain? My master nearly beheaded me with one stroke of her sword for his sake?" Xu Changsheng says, "Gu Siliang, you don't want your brother to be punished by His Majesty, do you?" "Your Majesty, you're already poisoned. Why struggle?" "Madam, even if you beg me with your 'mouth' over what happened to your son, I still... What? You have a daughter-in-law who's a divine healer?" "State Preceptor, you wouldn't want His Majesty to discover that you refined the fate of Great Zhou for your own cultivation, would you?" "Princess, don't turn around. I'm the prince." "…" As Xu Changsheng commits every imaginable misdeed, he earns the hatred of both gods and men. The Empress, the final boss, tries without hesitation to cast him aside like a pawn. But then she discovers… Xu Changsheng has long since seized power over the court and taken control of several cultivation sacred grounds. She herself has become a puppet empress, entirely at his mercy! "Your Majesty, why are you rebelling?" "Aah! Insolent! Traitorous scoundrel, how dare you treat me like this... Mm... I..."