I'm Already a Yang God, and You're Telling Me This Is a Ghostly Entity?

(No female lead, dark, immortal) Jian Meixin accidentally transmigrates into a low-martial, supernatural world inhabited by demons and ghosts. Jian Meixing starts out at the Yang God realm thanks to a sign-in, thinking he can punch the Demon Emperor and kick the ghosts. Isn’t that the perfect setup for an invincible protagonist? But reality quickly teaches him a lesson: this world isn’t as simple as he thought... My name is Jian Meixing: the Jian of “sword,” and the Meixing with no heart!