Demon Clan Double-Faced Civil Servant

Double-sided agent + single female protagonist + original setting + overturning conspiracy The male protagonist Lin Yue was originally an ordinary low-level monk, doing nothing, until one day he picked up the Ancestral Dragon's reverse scale and turned into a dragon. When I met the heroine, it turned out that she was a spy from the human race. Isn't that a coincidence? But why do the monsters in this world rely on examiners to become stronger! Let's see how the protagonist can get by in this world by relying on the reverse scale. I want both demons and humans!