Xuanzhen has been interested in astronomy since he was a child. During a stargazing process, he accidentally discovered the strange power fluctuations contained in the Seven Stars of the Big Dipper, and thus embarked on a journey to explore the secrets of the Big Dipper. In the rare ancient books in Chang'an City, he found the mysterious legend about Beidou's sacrifice to the sky, and decided to uncover this secret with his partners.
