Bai Si, a thousand-year-old snake, has joined the Urban Demon Management Bureau with an ancient certificate. She unexpectedly discovered that the director Shen Qinghan was the old man who was defrauded of the demon pearl by her two thousand years ago, so he became her personal assistant. The two work together to deal with the attacks of ancient ferocious beasts such as Qiongqi and Taotie, uncover the ghosts in the Demon Management Bureau, and combine the power of the Ice Phoenix and the Bassake to seal the cracks outside the territory. Unexpectedly, the real crisis is quietly approaching in the dark.
