Song Tingwan transmigrates into a cultivation novel, becoming the frail, ill-fated older sister of the story's protagonist, Song Si Yao. In the original tale, Si Yao endures a life of suffering in a slave arena before seeking vengeance for her clan's destruction, ultimately failing to ascend and dying in the heavenly tribulation. Determined to alter this tragic fate, Tingwan uses her knowledge of the plot to protect her family. She and their father locate Si Yao in the City of Chaos, rescuing her from the beast-fighting arena just as hostile factions trace the location of a coveted Heirloom Jade to the Cloud Hidden Clan. Knowing the clan cannot protect them from those coveting the artifact, Tingwan decides to leave their secluded home and seek refuge within the prestigious Wenjian Sect.
At the Sect's recruitment ceremony, Tingwan deliberately tests as a red-light outer disciple to maintain a low profile, while Si Yao reveals her true potential with a golden light, earning her a place as the Sect Master's personal disciple. Tingwan conceals her identity as a powerful pill cultivator known as Immortal Pillow Sleep, using a spirit network to anonymously treat high-level experts, including the Sect Master Yan Shanjun, for a mysterious Star Abyss injury. This secret arrangement allows her to operate in the shadows while ensuring the Sect remains a safe haven for her sister.
As Tingwan settles into outer sect life, she forms unexpected alliances. She befriends Qin Xi, a generous artifact cultivator, and encounters Wanqi Ji, a taciturn Body cultivator with a massive saber. Tingwan recognizes Wanqi Ji as a key figure in Si Yao's original timeline and takes it upon herself to support him, hoping to prevent the hardships that originally hardened his heart. Meanwhile, Si Yao thrives under the Sect Master's tutelage, protected by her new status and the wealth of gifts Tingwan provides. The sisters navigate the complex social hierarchy of the sect, with Tingwan using her wit to deflect bullies and Si Yao focusing on her sword cultivation.
The narrative shifts when Si Yao and Wanqi Ji engage in a fierce, uncontrolled duel that shatters the competition stage's protective formation. Both are severely injured but refuse to yield, their battle fueled by an intense, almost instinctual rivalry. Tingwan arrives to find the chaos, realizing that while she has changed many circumstances, the inherent nature of these powerful individuals remains unchanged. The story concludes with Tingwan managing the aftermath of the fight, aware that her sister's path is diverging from the original book, and that new dangers and opportunities are emerging as the Heirloom Jade's secrets continue to draw attention from powerful forces across the cultivation world.
