Trained to be an assassin to fulfill the request of her mother, Queen Hwansoo to take down the prince of the Ravieóne. Hyemin or very well-known as "The Ace" was challenged to kill the royal prince or Prince Kim Taehyung as a repay for his late debt. Will she managed to complete her task or will everything be turn upside-down after she meets the prince? Continue and read this story to know more about what will happen to her bloody life.