I Was Forced to Infiltrate the Demon Cult and Actually Became a Demon Cultivator.

As a replacement for the sect's saint, I was ordered to infiltrate the demon sect. This demon sect... Seems completely different from what I expected. Third Elder, help! The mission goal of "infiltrating and investigating" hadn't even started yet. I seemed to have become a celebrity in the Demon Cult, and I was also haunted by a strange beautiful girl who didn't look too smart but was extremely powerful! How on earth will I live my next undercover life?