Chi Yu, a modern gamer, dies from exhaustion after a week of late-night gaming sessions and transmigrates into the body of a cannon fodder concubine-born daughter in a cultivation novel. She is bound to System No. 666, which tasks her with two objectives: helping the male lead, Shen Yanzhou, achieve the Supreme Immortal Emperor ending, and romancing him to reach 100 Favorability points. The system reveals that failure results in permanent deletion, while success offers a return to her original life and a billion dollars. Chi Yu, motivated primarily by the financial reward, accepts the mission.
In the novel, the original author abandoned the story with a rushed ending after a losing streak, causing the protagonist Shen Yanzhou to fall into demonhood and slaughter the world. Chi Yu wakes up on the day she is forced to impersonate her talented sister, Chi Shuyun, as a sacrificial bride to a Great Demon. Instead of passively accepting her fate, she rebels, blackmailing her abusive parents for money and keepsakes before storming off to the demon’s cave. Inside, she finds Shen Yanzhou, a handsome youth bound among skeletons. Struck by his appearance, she immediately attempts to win his favor, calling him "husband" and defying the Great Demon to protect him.
Shen Yanzhou is aware that he is a fictional character trapped in a loop. He has lived through five previous cycles with different Task Executors, each of whom failed and was killed by him when he fell into demonic corruption. In this sixth cycle, he decides to counter-seduce Chi Yu. He pretends to be vulnerable and grateful, hoping to make her fall in love with him so her eventual death will be more despairing. Chi Yu, oblivious to his true nature, believes her direct approach is working. She uses a system item, the Demon-Shattering Blood Blade, to slay the Great Demon, sustaining severe injuries in the process. Shen Yanzhou secretly heals her with spiritual herbs, deepening her affection while maintaining his facade.
After the battle, Chi Yu exposes her family’s deceit to the cultivators, ensuring they face social ruin. She and Shen Yanzhou travel together to Taixu Sect for the disciple selection. Along the way, they rescue Jiang Jiuming, a clumsy but talented talisman cultivator who joins their group. The trio faces various comedic and dangerous challenges, including a failed flight on a mist cloud that leaves them publicly embarrassed. Upon arriving in Canglang City, Chi Yu struggles with finances but remains optimistic. She buys Shen Yanzhou second-hand cultivation materials and expensive clothes for herself, continuing to invest in his growth. Shen Yanzhou plays along, secretly accelerating his cultivation while pretending to be a slow learner to keep her protective instincts engaged. As they prepare for the sect selection, the dynamic between the unaware executor and the manipulative male lead continues to develop, setting the stage for future conflicts.
