Shi Qi, who becomes the intermediary: A living dead person (returned from death)
Bai Ze, the mentally ill patient: Not human (a remnant soul)
Chiyou, the Great Emperor and Lord of the Underworld: Not human (a ghost emperor)
A bond between two, a connection between three, entangled for ten thousand years.
It will all finally come to an end in this life.
Theme: Saving each other