As a Villain, I Want to Lie Flat Against the Righteous

Time Travel+Funny+Old Six+No Female Protagonist+Dark Belly Li Xuan traveled to a fantasy world, possessed the heir of a demon sect, and obtained a magic manual. In order to live well in this world, Li Xuan decided to hide the identity of the Demon Sect, join the ranks of decent people, pick up the golden rice bowl, and bully honest people. Thus, the story of a villainous boss causing trouble in the decent world begins. (Please don't raise books, please don't raise books, please don't raise books, say important words three times)