Underworld Immortal Master

No female lead but with a romantic subplot; not a saint or brainless character (as much as possible); villainous male lead.

Beyond the thirty-three heavens, beyond the nine layers of clouds dwell immortals.

Immortals were originally mortals, but the only problem is that mortals lack firm resolve.

Thirty years of human desolation, Cheng Liang only wishes to pursue herself.