The Undercover Demon Sect System Forced Me to Rebel at the Beginning

I, the undercover Demon Sect, only wanted to survive, but I was forced to rebel by the dog system! Since then: When the master talks, I sing! I touch the saint's little hands! The elder is treating me to a treat and I'm going to flip the table! The ancestor calls me uncle and I call me brother! Yan Tianjun, who let himself go, made great progress all the way, rebuking the elders, deposing the clan leaders, establishing a new religion, unifying the demonic path, and spreading military force all over the world! When he stood on the ruins of the Immortal League headquarters, he slapped his forehead: It's broken! I seem to be an undercover agent!