When a mortal woman unexpectedly reaches the powerful Refinement Phase overnight, a fox demon tries to drain her Yang energy but fails. As she confronts the demon, her compound’s guardian arrives sensing the demonic presence. The woman catches the injured fox demon, who is desperate to survive. She offers the demon a harsh choice: be captured or form a master-pet contract. The demon reluctantly agrees and becomes her spirit pet, named Bailey. This bond grants her new power and triggers a system reward, but the implications of enslaving the fox remain uncertain.