The story takes place in a distant future world. Michelle (Bai Ling) seems to be an ordinary woman, but her actual identity is a female killer employed by a human gene poaching organization. A life full of dangers and lies makes Michelle feel tired, and she has always wanted to quit her job. However, in order to ensure the safety of her brother Jack (Parry Shen), who is always making trouble, Michelle is forced to stay in the organization and complete one task after another. What Michelle didn't expect was that one day, Jack actually announced that he would join the gang. What's worse, Jack, who annoyed the big shot, became Michelle's next target. On one side is her blood relative, and on the other side is the cold and ruthless underworld. What choice should Michelle make?