The Founder of Diabolism (2018)

As the grandmaster who founded the Demonic Sect, Wei Wuxian roamed the world in his wanton ways, hated by millions for the chaos he created. Ultimately, he met his end at the hands of his dear adoptive brother, Jiang Cheng. Over a decade later, he finds himself incarnated into the body of a lunatic and runs into an enigmatic former classmate, Lan Wangji. The two men with opposing personalities embark on a mission to delve into the mysteries of spirits and ghosts, slowly uncovering dark truths pointing that the past wasn't as simple as it seemed, while Jiang Cheng suspects that Wei Wuxian has returned.

Unfortunately the movie The Founder of Diabolism is not yet available on HBO Max.