I'm an Undercover Agent, I Really Don't Want to Be a Demon!

[No system + unorthodox demon + the protagonist is an old man + light comedy] Li Lin traveled through time and became the Holy Son of the Hunyuan Dao Sect. Oh, the former Holy Son was sent to the Hehuan Sect at the beginning to become a wife and became an undercover agent placed by the sect in the Hehuan Sect. However, after the former Holy Son of the Immortal Sect entered the Hehuan Sect, which ranked sixth in the Demonic Path, the entire picture of the Demonic Path began to gradually become distorted. Head of the Hehuan Sect: What kind of furnace? That's my sweetheart! Side by side, we share the same clan master! Demon Seed of the Heavenly Demon Sect: My eldest brother has tortured me thousands of times. I treat my eldest brother as if I were my first love. I am born to be eldest brother's person, and I will die to be eldest brother's ghost... Brother, I have already recited it according to your request, so please don't torment me! Ancestor of Moyin Valley: You say that I am sinister and cunning, but I don't accept it! Is that kid as sinister as I am? He, he doesn't talk about magic and virtue! Sneak attack on me! You have to give me peanuts! The First King of the Blood Demon Heaven: Can you believe it? All my blood stores were replaced by wine! This king has not known the taste of blood for a whole year! Look at those little "cutes" of this King, damn one of them has become an alcoholic! Three years later, all the sects of the Immortal Sect united to attack the Demonic Way, only to find that the person sitting on the throne of the Demon King was Li Lin, the abandoned son of the Immortal Sect! Li Lin opened his arms: Fellow Taoists, you have finally enlightened. You are welcome to abandon immortality and become demon! Become a part of the magic path of building civilization!