I Woke Up as a Demon Lord?

(Heavenly Demon + Seven Emotions and Six Desires + spiritual qi revival + multiple heroines, no exclusive pairings + character class panel + slow-paced + wish fulfillment + not invincible) I, Zhong Lingyu, spent one day working part-time as a haunted-house sleep tester. The bad news: The haunted house really was haunted! The good news: The ghost was a woman, and she was gorgeous! She didn't kill me. She just spent the night having a friendly chat with me! When I woke up the next morning, a player panel had appeared in my mind: [Heavenly Demon (Unique)] [Master of the Desire Realm, free to take any form.] [Neither human, ghost, god, nor demon...] [Transcending all conventions and bound by no rules.] [As long as desire exists in the world, the Heavenly Demon will endure!] [One and only, above heaven and below!] [Congratulations, player. You have taken up the class: Heavenly Demon] Wait, I only went to sleep. How did I become a Heavenly Demon?! And spiritual qi revival had only just begun in this world. Zhong Lingyu couldn't shake the feeling that something was missing from this world! Heh heh heh, that's right: the Heavenly Demon's specialty! But the entire Blue Star world followed the path of class-based transcendence. There was no such thing as heart demons arising during cultivation! So he decided to place a shackle on every living creature in the Blue Star world, or perhaps give them a gift. It was called the Heavenly Demon Trial! Those who pass will have steadfast hearts; those who fail will have their Dao-hearts shattered! Of course, there's one other possibility: embracing the Heavenly Demon willingly... (The early stages: spiritual qi revival; the middle stages...)