Qin Feng, a modern young man, is transported into the world of immortal cultivation and becomes the heir of the Qin family. After being poisoned by his uncle, Qin Tianba, he has only one day left to live. At the brink of death, he activates a life-burning cultivation system that allows him to steal lifespans and deduce forbidden techniques. From then on, he fights to survive through killing and battles his way toward immortality, eliminating enemies and demonic beasts as he rises to power and seeks revenge. He ultimately kills Qin Tianba and his son, and meets Gu Qinglan, the cold yet kind-hearted commander of the Demon Suppression Bureau. Together, they confront the demonic cultivator Xue Tu and the forces of the Qingyun Sect. To cure the life-devouring Withered Heaven Poison, Qin Feng ventures deep into a forbidden demonic realm and battles the Blood Young Master. With the support of the entire city's people, he awakens an ancient star-powered battle mech and crushes the Qingyun Sect's leader, finally putting an end to the chaos. In the end, he gives up his journey home and chooses to stay with Gu Qinglan, beginning a new life devoted to protecting the one he loves.