Villain: Infinite Devouring and Evolution, Starting as a Little Demon

[Villain Protagonist + Dark Fantasy + Devouring + System, Dual Cultivation Systems + Breakneck Pace (One Kill Per Chapter)] Su Fan binds himself to the Devouring Evolution System and transmigrates into a dark world of cultivation. Cultivators use mortals' brains to make medicinal ingredients, take babies' hearts as medicinal catalysts, and use women's skin to craft talismans. Su Fan cultivates to serve his country and its people. He treats the sick and saves lives, casts spells to bring rain for villagers, and drives out demons to rescue people, only to be betrayed by the villagers! He comes to understand humanity's selfishness and treachery! Every man for himself, and the devil take the hindmost! And so he sets out on his own path of villainous devouring!