The story takes place in an era when the legendary Catastrophe is imminent.There is an immortal sect in Shu called the Peak of Death and Life. Elder Chu Wanning of Yuheng, the Peak of Death and Life, has profound spiritual power and is known as the "No. 1 Grandmaster in the World". Among his disciples is a young man named Mo Ran.Chu Wan Ning is pure and upright, and has always taken it as his own duty to protect the human world and defend the Heavenly Split.Mo Ran suffered a lot when he was young but was kind-hearted and talented in cultivating immortals. However, he often disobeyed discipline and always antagonized his master Chu Wanning due to misunderstandings.An accident gave Mo Ran an inexplicable memory.In memory, Mo Ran's senior sister Shi Mingjing died because of Master Chu Wanning's failure to save her.With the resentment towards Chu Wanning in his memory, Mo Ran began to secretly be wary of Chu Wanning, and even made moves to hurt Chu Wanning.Facing the “change” of Mo Ran, Chu Wanning still insisted on teaching him to follow the right path, do justice, and his original intention of joining the world and supporting the path has never wavered.Mo Ran, who was trapped in the boundary between good and evil, found a secret that he had never noticed in his memory.In the process of getting closer to the truth, Chu Wanning also discovered that there was another reason for Mo Ran's rebelliousness.Although the truth is heartbreaking, the mistake has been made. When the real catastrophe of the mortal world comes, in order to save the common people, Chu Wanning, Mo Ran and the heroes of the cultivator join forces to find out the real culprit behind the scenes.What is true and what is false, what is right and what is wrong, in order to save the people of the world, how can Mo Ran, the prodigal son who turned back, complete his self-salvation in the face of sins from another world?How will Chu Wanning face his apprentice who once went astray?What kind of shocking secret does his life experience contain?Will the master and apprentice still be at each other's throats like in the other world in their memories?Mistakes have been made, but the heart can be changed...