Langyue is the son of a wealthy businessman in Qiushui City. He rescued Lan Qing, a mysterious man who lost his memory on an autumn night, but she didn't know that he was actually a monster. As they get along with each other, Lan Qing's hidden power is gradually revealed - he can control butterfly wing spells and reverse time and space. When the man in black comes after him, Lan Qing appears as a demon to protect Langyue, but disappears in the battle. On the verge of death, Lang Yue touches his remaining demon pill and accidentally opens the memory of his past life - three hundred years ago, he was Lan Die who was rescued by Lan Qing on the top of Kunlun Mountain. The so-called "reincarnation" is just a scam woven by monsters using their lifespan.
Now Lan Qing has reversed time and space and reversed the direction of the Concentric Curse. Using his own life as an anchor, he vowed to rewrite the outcome of Lang Yue's death. As the two embark on a journey to find the truth, those forgotten memory fragments gradually piece together the cruel truth: with each reincarnation, Lan Qing will disappear faster; and the demon pill sleeping in Lang Yue's body is the key to reversing life and death...
Purpose: Love only one person in your life