Crazy Undercover Demon King

I don't know which mysterious boss of the Nine Heavens Immortal Realm is extremely bored and wants to play the Infernal Affairs of the Three Realms. So, Cheng Ren was so miserable. One second he was "enjoying" the blessing of 996, and the next second he woke up, he transformed into a giant golden eagle with black eyes and nine claws! Nine-day seven-star grass provides him with strong power that never fails. Refined into a demon, he was ordered by the Great Demon King to go to the human world to work as an undercover agent. The master said that he is very demonic. It would be a pity not to go to the demon world to spy on military intelligence! The big devil said, I have a set of secrets for cultivating demons here. Go to the demon world and keep an eye on me! Boss: The Three Realms are coming. What's going on? Got the wrong script? !