From the idea of Taoism, Guang Chengzi was the avatar of Taishang Laojun (also named Daode Tianzun) during the period of Yellow Emperor in ancient Chinese history.
From the novel of Fengshen Yanyi, Guang Chengzi is the student of Yuanshi Tianzun, who is the co-founder of Branch Chan of Taoism.
After he, along with his fellow immortal by the name of Chijingzi had been passing by King Zhou's capital, Zhaoge, two very large beams of red light from heaven had impeded Guang Chengzi's path.
After Guangchengzi personally saw beneath him the unfortunate events taking place - the near execution of both the crown princes Yin Jiao and Yin Hong - Guang Chengzi would say that it would be best to create a very large tornado over the capital and use the confusion to steal both of the princes – as to ensure the creation of the new dynasty.
As a youth who had little social experience, Yin Jiao accepted Shen Gong Bao's suggestion and fought against King Wu's army, contrary to his teacher Guang Chengzi.