Prehistoric: the Apricot Tree Became a Spirit and Became a Disciple of Yuanshi Tianzun

An apricot tree on Kunlun Mountain started the path of spiritual practice after Lin An traveled through it. He witnessed the confusion of Sanqing before he became a saint, secretly learned the true meaning of Taoism, and finally transformed into the Yuxu Palace and worshiped in Yuxu Palace, becoming Xuanchengzi, the first disciple of Taoism, vowing to leave his own traces in the world.