The No.1 Undercover in the Immortal World

I, Lin Yun, with my exceptional aptitude, had thought that I would be trained as a key disciple, however...
"The Demon Sect will never expect us to send such an excellent disciple undercover. Once you attain a high position within the Demon Sect, with our help both from within and without, why would we worry about the Demon Sect's destruction?"
Three years later.
"The Righteous Path will never expect us to send such a promising disciple undercover. Once you attain a high position within the Righteous Path, with our help both from within and without, why would we worry about the Righteous Path's destruction?"
Lin Yun: I just want to quietly cultivate to immortality...