Xia Changsheng, a modern overworked office worker, suddenly dies and awakens as a pig demon in the Kingdom of Women, narrowly escaping being sacrificed as an ill omen. Without a system, he relies on modern knowledge to resolve the water crisis of the Mother-Child River and is appointed the Imperial Preceptor. He navigates the suspicious High Priestess, the valiant female general, the devoted Empress, and Ling Yue, the regent of the rival kingdom, gradually uncovering the thousand-year-old secret that the Heavenly Dao has been raising the two kingdoms like livestock and that he is the reincarnation of the Pig God. To break free from his destined fate, he leads everyone in fighting the out-of-control Heavenly Dao, breaks the curse separating yin and yang, and brings about the union of the Kingdom of Women and the Kingdom of Men, finding a happy ending amid love and hatred.