Lin Fan transmigrated into the role of sect leader of a declining immortal sect, unaware that all twenty thousand or so people in the sect, except him, were undercover agents sent by the Demon Cult, the demon tribes, and assassin organizations.
As it happened, the various factions knew nothing about one another. To hide their identities, they were more righteous than the righteous sects:
The Demon Cult elder strictly enforced the sect rules.
The Poison Sect's Holy Maiden refined miraculous pills.
Top assassins guarded the mountain day and night.
They even competed to steal treasures from their own headquarters to subsidize the sect.
Years later, the Lingxiao Sword Sect had risen to the top of the world, while the demonic factions had been fleeced until they were penniless.
Only when the allied demonic forces arrived at the foot of the mountain did every undercover agent in the sect draw their swords as one, pointing them at their former employers.