Bai Zhifei, who crossed into a different world and harbors Golden Core cultivation, works as a veterinarian in the demon clan's imperial city, relying on the system to treat illnesses, accumulate experience, and prolong his life. An assassination entangles him and the amnesiac girl A Ling in a conspiracy involving the princess's poisoning. Entering the palace for treatment, he discovers that the poison afflicting the princess shares the same origin as his own mortal tribulation, whereupon he forces out the poison with three needles, shocking the entire hall. The old grudges of the Tianhua Sect remain unresolved, and the hidden hands in the palace press closer step by step. He only wants to make money and survive, but the Demon Emperor bestows ten thousand taels of gold and the position of National Teacher! This house call cures an illness and wagers a life!