Reborn, What Should I Do If My Master Won't Let Me Practice Evil Cultivation?

[A Truly Evil Woman + Fake Rebirth + All Men Are Devoted + True One-Against-Many] Content warnings: One-against-many, Lovecraftian elements, not a doting-wife type, obsessive characters. Huan Xu has been reborn. The good news is that she knows the script in advance. The bad news is that her master knows it too, and in this life he seems to have lost his mind. In her previous life, she was the one who cut off his hands and feet. Yet in this life, he insists on taking her as his disciple, races to become a demon, and eventually packages himself up as the Demon Lord and delivers himself to her, asking if she wants the position. One reborn master would be one thing, but what does it mean for everyone to be reborn? Has the world got a bug? She only wants to become stronger, yet somehow has to win them over one by one. She works hard until she becomes invincible, but still can't even cultivate as a demon? Come on, she's the evil cultivator here!