After Sanqing attained Taoism, he perfected the cultivation system and went to find the subsequent cultivation techniques that had disappeared for a hundred thousand years. Before leaving, Yuanshi Tianzun was afraid that people in later generations would take Taoism to an extreme, so he left a sentence to the world (only those who follow the rules can be immortals, and those who are outside the rules are defined as demons, and demons cannot enter the Tao). Yuanshi Tianzun has reached the point where his words follow the law, and his words form the laws of heaven and earth. The laws of heaven and earth constrain the path of spiritual cultivation for those who are most passionate and spiritual. Nanji Xianweng is the great disciple of Yuanshi Tianzun. His longing for Yuanshi Tianzun formed an obsession. He entered Taoism with his obsession and was judged as a demon by the laws of heaven and earth, which cut off his path of cultivation. In order to open up a path for the most passionate people, he and Jiang Ziya made a plan to find the eight immortals who were obsessed with it, so Lu Dongbin searched for the eight immortals.
