This faction, with beliefs opposed to those of the Celestial Emperor, mostly belongs to the type of sacred beings with rebellious tendencies.
In the past, Master Yuan believed that the Celestial Emperor was supremely fair and should not have 'secrets.' The Nine Heavens Secret Scripture has a 'secret' character, preventing others from studying it, doesn't this prove that the Celestial Emperor has selfishness?
Master Yuan, with his innate rebelliousness, unwilling to follow conventions, stole the Nine Heavens Secret Scripture to the lower realms, recording it in Baiyun Cave.
Once the Celestial Scripture is inscribed, it cannot be erased. Master Yuan wanted the beings of the lower realm to also learn the Celestial Scripture monopolized by the upper realm, but doesn't such an act equate to treasonous rebellion?
If it weren't for Master Yuan's teachings from the Profound Lady, he might have been suppressed in Baiyun Cave as well, paired with that old fox!