The film tells the story of a "new mission" from the Monster Hall. Faced with a series of mysteries, Xiaohei and his senior sister Luye embark on a new adventure to find the truth.

Hao Ren was a typical young man from a small city who was barely making ends meet while living in an old house. However, via a strange turn of events, he becomes a "universe police officer." A problem is developing in his domain, the Dream Plane Universe, as he struggles to oversee a home inhabited by strange, non-human residents that his enigmatic superiors have assigned him.