Xuan Xiao, who had been sleeping in the North Sea for a thousand years, awakens and obeys the new rules to go to the Anomaly Bureau for non-human registration. A single mention of his true form spanning three islands causes the whole hall of demons to burst into laughter, with only Bai Min recognizing this ancient ancestor. Wuzhiqi, the fierce demon underground, grows exponentially in power, and the seal is on the verge of breaking. Xuan Xiao steps in with a puppet body to quell the catastrophe, originally seeking only a stable foothold, and accidentally gets appointed as a special consultant of the Anomaly Bureau. The ancient giant turtle, who survived the primordial floods of antiquity, thus remains in the present world, watching the fireworks and mortal life fill the city.