The immortal Xianyu Ling just wanted to live in peace for a thousand years, but he picked up a picky and venomous black cat on a rainy night. Unexpectedly, the cat master is actually the ancient demon king, and she insists that she is the key to solving the curse of the clan, the "eternal person". After being forced to sign an unequal cohabitation treaty, the two used their thousand-year cultivation to complain about modern life while working together to deal with urban monsters. When the truth of the blood contract is revealed, and thousands of years of loneliness meet the fate of the race, is this unexpected contract an unintentional fate, or is it the result of deep love?
