The protagonist, a 16-year-old female assassin known as the sharpest blade in the assassin world. She was taken in by an assassin organization since childhood and mastered ancient martial arts, toxicology, combat, and stealth over ten years of training. She never failed a mission until she accidentally drank a transparent poison from her own vial, which shattered and splashed into her mouth. She transmigrated into the body of Ah Yue, a dark guard in the novel Noble Daughter's Prestigious Marriage. Cold, efficient, and disdainful of weakness, she finds herself in a new world where her new master is Pei Qingmin, the useless invalid she once mocked.
