The little girl Su Changyue was originally an orphan whose family was broken up. She met the young Taoist priest Zhou Tianji and was taken home by him as his sister. After that, she gradually grew up into an upright and kind-hearted girl, and then performed various chivalrous acts. Among them, he also met Yuwen Hao, whose life was saved by Zhou. Later, with the help of Su and Zhou, Yuwen exposed the villain's plot and took the throne.