Love Brain Protagonist and Psycho Villain's HE

Fan fiction spin-off, main tag: "Derivative Fan Fiction" (this tag was changed by Tomato itself). Romance? Strong male lead, even stronger female lead? Cultivation? Occult? Absurd? Fast-paced, refreshingly clear-headed, steel-straight female lead with maxed-out combat power—Di Yan'ge? Originally a domineering male lead, now a love-struck little husband with maxed-out life skills—Xiao Jue (I'm a CP fan, so watch out for spoilers). This has nothing to do with the spin-offs by Chuchuzi Yu; the timeline is after the original story's ending. Synopsis: Di Yan'ge once made a spectacular mess of thing…