The world re-ignites for our protagonist, not with a gentle dawn, but with the searing agony of a divine headache—the raw, physical consequence of an Immortal Ascension stage soul crammed into the fragile vessel of an eight-year-old girl. A millennium of cultivation, memories, and the bitter taste of betrayal flood her consciousness, her mind a supercomputer running on ancient hardware, capable of astounding feats yet bottlenecked by the mortal body's limitations and sluggish thinking. Her immediate target is the "idiotic shit donkey," the main character responsible for her premature demise, whom she tracks to a dilapidated seaside hut using a sliver of her residual divine sense, the sole remnant of her past power. She finds a bewildered, dirty six-year-old boy, Little Spring, orphaned and alone, yet bearing an undeniable resemblance to her hated nemesis. With audacious flair, she declares him her junior brother, asserting a past life connection and demanding repayment for a death he has not even caused yet. This forced adoption requires a masterful, cliché-ridden lie to her unsuspecting, mortal parents—a tale of an immortal dream and a divine mandate to take the boy in, subtly reinforced by a touch of her formidable divine sense. Despite her internal contempt for the "dumbass Xianxia harem novel" tropes and the infuriating filial piety demands of this new life, she begins the arduous task of re-cultivating her path, unveiling her self-devised, "Lin's Fucking Kickass Cultivation Technique, No Peeking," a testament to her past ingenuity. The process is slow, fraught with the physical limitations of her young body, and the frustrating realization that her memories are fuzzy without her full cultivation. Yet, amidst her cynical machinations and exasperated internal monologues, a tender sprout of genuine care emerges. She finds herself comforting the grieving child, who mumbles for his mother in his sleep, offering clumsy but heartfelt words of solace, an unexpected human connection that begins to soften her hardened heart in her grand, vengeful scheme. This initial encounter, a blend of coercion and reluctant nurturing, sets the foundation for a relationship that defiantly veers from the original plot's trajectory, hinting at a future dramatically different from the one she escaped.

Two months into her forced mentorship, Fairy Lin grapples with Little Spring's slow progress, a stark contrast to her own rapid ascent through Qi Condensation layers; she is at the second layer while he has yet to sense Qi, a fact that irks her despite his persistent efforts. Their quiet, if chaotic, existence is shattered by a terrifying voice echoing through the village—the arrival of the Immortal Flower Thief, a loose cultivator from her past life's memory, who terrorizes their village, demanding daughters and food. Fairy Lin recognizes this scum, recalling him as barely not a demonic cultivator. As villagers cower and men fall, Little Spring, despite his complete lack of cultivation, attempts to defend Fairy Lin, only to be gravely wounded, thrown aside with a sickening crack of bone. This near-fatal sacrifice ignites Fairy Lin's dormant fury, compelling her to unleash a devastating wave of divine sense, instantly incapacitating the Flower Thief by making him think she is a peak Foundation Establishment master, then summarily executing him with his own looted flying sword. With the villain's possessions secured, her focus shifts entirely to saving the dying child. Through a desperate application of a low-grade healing pill, meant for mortals, and a precise infusion of her spiritual energy, Little Spring is pulled back from the brink, his innate bloodline awakening in a torrent of healing power that floods his system, repairing his broken body. This pivotal event not only solidifies Little Spring's belief in cultivation but also forces Fairy Lin to confront the burgeoning, unintended bond between them, pushing her to vow to raise him as a "better, smarter cultivator," far removed from the selfish "Bloodsword" of her forgotten future. The terrifying ordeal, culminating in the acquisition of a flying sword and storage bag, prompts them to accelerate their plans to leave the village for the safety of a sect, escaping the villagers' fear-laden stares.

The path to a better future for Little Spring leads Fairy Lin to examine his meager keepsakes, revealing a jade hairpin, a flying fan, and a mysterious stone bowl—relics far more significant than their humble appearance suggests. The stone bowl, activated by Little Spring's blood, transports them to a hidden inheritance space, a "golden finger" of immense potential, complete with a spiritual lake and various utility rooms. Inside, they encounter Ghosty McGhostface, a trapped Nascent Soul ghost, and two high-ranked cultivation techniques. Driven by a desperate need for knowledge to better guide Little Spring and understand the world, Fairy Lin audaciously memorizes both complete inheritances simultaneously, an act that pushes her mortal body to its absolute limits, aggravating the dichotomy between her powerful soul and weak physique, leaving her with a mere six months to live unless she rapidly advances her cultivation. Undeterred by her impending doom, she subjugates Ghosty, enlisting him as a reluctant aide, and crafts a unique, personalized cultivation technique for Little Spring, perfectly tailored to his bloodline. Their journey then takes them to Golden Aspect City, where Fairy Lin, leveraging her past knowledge and formidable alchemy skills, enters a youth tournament with the express goal of winning a spiritual cauldron to aid her urgent self-healing. In a display of audacious talent and strategic brilliance, she not only triumphs, humiliating her future rival, Violet Pill Fairy, but also accrues significant resources and a burgeoning reputation as an alchemy genius. Unbeknownst to her, Little Spring's accidental interaction with a special jadeite stone further expands their inheritance space from a humble farm to a county-sized domain, momentarily locking her out of the space and setting the stage for even greater challenges and the realization of his protagonist-level luck.

With her life hanging by a thread and a burgeoning reputation, Fairy Lin pivots to securing their entry into the Indomitable Will Sect, navigating a complex web of political intrigue and personal vendettas that she, as an experienced immortal, recognizes from her past life. She strategically encounters the Junior Sect Leader, Unyielding Firestorm, and his team, including the arrogant diviner Glittering Iron Omniscience, the devoted Justice Reaching Divine Blade, and the outwardly sweet Fairy Blissful Jujube, who was once Bloodsword's first wife. Using her foresight and keen observation, Fairy Lin uncovers Glittering Iron's treacherous plot to murder Unyielding in a natural slaughter formation and frame Fairy Third Peach Sapling, meticulously gathering proof through a jade slip recording. She exposes his malice, saving Unyielding's life and solidifying her credibility. Upon arrival at the Indomitable Will Sect, she audaciously confronts the ancient spirit of the sect gate, revealing her transmigration and past-future knowledge to gain passage and a unique alliance, promising future repairs in exchange for entry. The subsequent sect trials prove to be a gauntlet designed not just to test but to expose and break, yet Fairy Lin, with her vast experience and strategically hidden strength, excels. She navigates a deadly rope bridge, triumphing over 888 magically enhanced arrows, deliberately choosing to reveal her formidable skills. During a trial involving demonic statues, she uncovers a sinister demonic infiltration aimed at releasing a powerful elder, preventing a catastrophe and further exposing the sect's vulnerabilities. Her quick actions and unwavering resolve solidify her standing with the sect leader, Peerless Resolve, who, recognizing her immense value and the danger she now represents, enlists her as bait in a high-stakes counter-infiltration, promising her entry and protection, thereby thrusting her deeper into the sect's hidden conflicts and the grand design of her new, altered future.