The Plan to Save All the Male Protagonists

There is nothing special about Bai Cha except that she is pretty, but since she was targeted and witnessed the crime scene, she was chosen by the male protagonist in the book to conquer the villain, save the awakened cannon fodder villain, and torture the male protagonist in a fancy way, ensuring that everyone will be killed. But seeing that the villain was too scary, Bai Cha decided to save the country by going all out and starting as the villain's little follower...