Phil Preston, a recent graduate and newly transmigrated Demon Lord in the cultivation world of Jadeth, struggles with his powerless state and hostile demonic followers. Just as he contemplates giving up, a mysterious system appears, revealing that he has only six hours to live due to his past evils. To survive, Phil must complete system tasks, earn merit, and rise as the top saint—an ironic twist for a Demon Lord. Forced to stop his sect from massacring the righteous factions, Phil reluctantly takes command, vowing to crush any disobedience, setting a tense battle ahead with uncertain outcomes.