Demon Fairy Cutting the Sky

If I want to become an immortal and the heaven refuses to let me go, then I will become a demon and come to destroy the heaven! The way of heaven is unfair and the path of immortality is difficult to tolerate. Since you can't become an immortal, you can turn into a demon and defeat the sky. Trample the universe, settle the rules of heaven, and finally create a unique path of demons and immortals.