Shen Lanyue, who studies martial arts on the mountain, is forced to go down the mountain due to her family's bankruptcy, and stumbles into becoming Fu Yanshen's private bodyguard. With her cheerful and lively personality, as well as her bizarre train of thought and comical nature, Shen Lanyue not only successfully becomes an indispensable bodyguard to Fu Yanshen, but also shines like a ray of warm sunshine into Fu Yanshen's lonely and gloomy dark life.