Cats were nocturnal creatures, and would spend two-thirds of their lifetime sleeping or napping. Humans rose up upon hearing the crow of a rooster to practice the sword [1], and would spend two-thirds of their lifetime studying, working, living, and laboring. When humans fell asleep at night, it was the time of the day when cats were their most energetic and vigorous. The two types of living creatures with the complete opposite work and rest times would actually attract each other. Wasn’t forming an unbreakable ally a marvelous thing? The relationship between cats and humans were similar to marriages, needing protection and patience from both parties. Humans spent time shoveling cat feces, spent money to treat cats’ illnesses, gave a lot of care and effort to provide comfortable living environments for cats, and mocked themselves with terms like "feces scooper" and "cat slave."