Teng Yuyi was killed by a treacherous person, but when she woke up, she found herself transported back to the year before her death. Her cousin was still alive, her grandfather was in good health, and she unexpectedly acquired the "Xiaoya Sword," a divine blade capable of slaying demons and monsters. With this magical sword by her side, Teng Yuyi set out on a journey to uncover the truth behind her previous death. During her quest, a chance encounter led to a clash with the heir of Prince Cheng. Though their first meeting was fraught with conflict, they gradually developed an unlikely bond, launching into a chaotic yet collaborative journey to hunt demons side by side.