The Remnant Soul of the Immortal Emperor Fell into the Mortal World, and Returned from the Counterattack to Shake the Heavens

[No system + invincible + behind the scenes + recruiting disciples] The peerless immortal emperor Zhang Bairen was killed by his apprentice, and his remaining soul lost his memory and wandered to the Zhengyang Realm. In order to regain his memory, he decided to pursue his dream and become a teacher who speaks lotus flowers and preaches to thousands of people. In his spare time, he also has to battle wits and courage with his evil side. A hundred years later, the fairy world merged, all the remaining souls were recovered, and their power was even greater than before. They returned as saints and controlled the way of heaven. (The several volumes before the fusion of the fairy world mainly focus on the stories of the people of Zhengyang Realm and Zhang Bairen's disciples, but after the fusion, it is the story of Zhang Bairen. Some chapters talk a lot about setting, if you feel it is too long, you can skip it, it will not affect subsequent reading) (Please leave comments, your comments are the motivation for me to update)