Gu Buyan, a demon slayer from the Imperial Astronomical Bureau of the Great Ming Dynasty, has slain countless demons. While pursuing a demon, he encountered a ground fissure and accidentally fell into modern Yuncheng six hundred years later, where he was picked up and taken home by Su Wanqing, a solitary archaeology girl. Sashing televisions, fighting faucets, and job hunting without papers, the cold-faced god of killing stirs up a series of jokes in modern times, yet returns to his old trade in supernatural bizarre cases. Human bone golden cups, yellow demons, giant snake gu poisons. He has several showdowns with the Special Task Force Nine, which specializes in unscientific cases, and further uncovers bizarre cases such as a fox demon reincarnated to seek her husband, and a rich woman raising gu to revive her deceased husband. When the flying fish uniform collides with skyscrapers, Gu Buyan re-reads the meaning of home and faith in the bustling human fireworks!