Years ago, a young cultivator named Wei Wuxian rose to fame by discovering a new school of cultivation that involved the manipulation of dark energy and raising the dead (both of which had never been done or attempted before). He used said abilities to give the cultivation clans an edge over their common enemy, the tyrannical Wen Sect. Over time, however, Wei Wuxian came to be feared and hated, and soon he met his grisly end at the hands of the people who once trusted him.
Thirteen years after Wei Wuxian's death, Mo Xuanyu, a mentally-troubled cultivator, decides that he has had enough of his family's abuse. He casts a spell that summons Wei Wuxian's spirit — long thought to be scattered and destroyed — into his own body, in exchange for Wei Wuxian granting his wishes of revenge. Everything that happens after that, however, is up to Wei Wuxian to decide. But he's not alone in this journey that is his second life, as he finds himself accompanied by Lan Wangji, an acquaintance of the past whom he has a complicated history with.
Along the way, they encounter new mysteries that are more connected than they initially seem. At the same time, the mystery that is Wei Wuxian himself is slowly unveiled.
Is Wei Wuxian a hero or a villain? How much about the legends of the Yiling Patriarch are true or false? And how blurred is the line between good and evil?