Modern teenager Fang Xuan accidentally transmigrates into an angst-filled romance novel, binding with a bizarre cultivation system, and unexpectedly becomes the exclusive cultivation subject of the original novel's female lead, Ning Xue. To complete missions and rewrite Ning Xue's tragic fate of destroying the world and dying a miserable death, he bites the bullet and approaches this cold senior sister, delivering medicine, protecting her, staying by her side, and having to cope with the system's bizarre judgments. He fights the green tea female supporting character, talks back to the villainous peak master, and while being forced to rack up cultivation points, he silently guards Ning Xue. Originally intending only to complete missions to save his life, he develops genuine feelings through day-to-day companionship, moving toward a mutual devotion with the reborn senior sister who hides her sharp edge, jointly breaking the deadlock and seeking revenge, opening a sweet romance path of immortality cultivation.