How Did I, a Noble and Upright Person, Become the Demon King?

Xia Ji pursued fame and fortune seriously in his previous life, so he died of overwork. He vowed that if there was an afterlife, he would be serious and carefree. When he woke up, he actually traveled through time and became a "closed disciple of Wudang Master". As an upright disciple of a famous family. You have practiced the [Bahuangliuhe Only Self-Exalted Skill], and you have become gigantic. You practiced [Ri Yao Huang Ting Sutra] and you became a fire demon. You swallowed the [Samadhi True Fire], [Nirvana Buddha Fire], [Vajra Earth Heart Fire], and you became... You are aware of the dangers and mysteries of this world, and decide to stay in Wudang Mountain and be a free and decent person for the rest of your life. Until that day, the demon world invaded, the gods and Buddhas were destroyed, and when the world was in panic, many great powers appeared one after another to turn the tide of the war. One day, the Demon King will kneel down in front of you and respectfully say: "Please come out of the Mountain!" You:? ? ?