Tian Long, a man scarred by a life of captivity and a rapidly waning lifespan on Earth, finds his desperate salvation in the enigmatic Death Book. This potent artifact, a grim instrument of vengeance against his sole oppressor, becomes the linchpin of an audacious plan: to shed his doomed existence and transmigrate to a fabled cultivation world. His self-penned death sentence in the Death Book, a five-minute grace period after possessing a new body, is a high-stakes gamble to test the artifact's power in a new reality. The journey through the chaotic spatial tunnel is a crucible, tearing his physical form asunder and, startlingly, disintegrating the seemingly indestructible Death Book itself, its essence silently merging with his soul. He reawakens not in power, but as the frail, three-year-old Prince Davis Loret, son of the Loret Empire's Emperor, a world away from his miserable past. Struggling with a new language, a child's body, and the overwhelming, unfamiliar love of his mother, Claire, Davis grapples with guilt over inhabiting another's life. His emotional turmoil, however, inadvertently triggers a breakthrough to the Nascent Soul Stage, a feat unheard of for a child. This anomaly draws the stern gaze of his father, Logan, forcing Davis to fabricate a tale of "awakened past life memories." The convenient lie is accepted, cementing his new identity within the royal family and binding him to a destiny intertwined with their love and protection. This miraculous rebirth, however, merely exchanges one set of chains for another, setting the stage for deeper internal and external conflicts.

Haunted by the lingering guilt of possessing another's body, Davis faces his first true internal battle against his past. The Redemption Tower, a facility meant for cleansing souls, becomes the arena for his Heart Demon trial. Here, he is forced to relive the horrific decade of torture and enslavement under Twizer, the sadistic man who warped young Tian Long's innocence. The illusion vividly recreates his suffering, from brutal beatings to psychological manipulation, pushing him to the brink of depravity as he contemplates revenge on Twizer's innocent daughter. Yet, a flicker of his former self, a silent vow to avoid the path of evil, allows him to conquer this profound Heart Demon, leading to a significant breakthrough to Mid-Level Nascent Soul Stage. This victory solidifies his resolve, propelling him into rigorous cultivation across all three systems. Under his parents' tutelage, he swiftly progresses in Body Tempering, reaching Silver Stage, and Essence Gathering, reaching Meridian Refinement Stage. A pivotal moment arrives with the absorption of the dangerous Fallen Extinction Lightning, a Sky Grade elemental, which, combined with his powerful soul, catapults his Soul Forging Cultivation to Peak-Level Nascent Soul Stage. Amidst his rapid ascent, he forms a unique bond with Ellia, his personal maid, whom he endeavors to uplift, unknowingly laying the groundwork for her own formidable journey.

The fragile peace of the Loret Empire shatters with the revelation of a continental war, instigated by the treacherous Emperor Tritor, who had previously engineered the rebellion. Witnessing his family's vulnerability, Davis adopts the alias "Dead End" and, leveraging the Death Book's terrifying power, embarks on a clandestine campaign of assassinations. This culminates in a shocking display of power during the Grand Sea Continent Meet where he massacres two million invading soldiers, an act attributed to a "mysterious senior." Emperor Tritor's subsequent assassination attempt on Davis and Ellia, using a formidable Spirit Beast Stage viper, is brutally thwarted, deepening Davis's resolve for vengeance. At the Grand Meet, Davis publicly humiliates Emperor Tritor, showcasing his prodigious talent by effortlessly defeating his opponents, including the proud Princess Shirley Ashton, revealing his Young Soul Stage cultivation and Silver Stage Body Tempering. He strategically annuls his engagement to Shirley, further solidifying his bond with Evelynn, while simultaneously embarking on Alchemy training. This period marks Davis's full embrace of his dual identity—a compassionate prince to his family, a ruthless force of nature to his enemies—setting his sights on avenging his family and uncovering the secrets of his mother's "outsider" origins.