Liu Sixi is the only son of a wealthy family of demon hunters, and he has an extraordinary gift: any demon or human who absorbs his vital essence can greatly increase their power. He's also a playboy who spends his days surrounded by women. Jiumei, the youngest princess of the fox clan, is kind, adorable, and graceful, but she's also an inventor and a prankster. Hoping to obtain Liu Sixi's vital essence for her mother, Jiumei sneaks into the Liu residence. But to her surprise, the two fall for each other. Enemies become lovers, and from then on, the womanizing demon hunter and his unruly fox-spirit girlfriend embark on a romantic pursuit between immortals and demons that will have you laughing and crying.