According to my knowledge of online literature, there may be some reasons for the replacement of the female broadcaster in the audio novel about the devil's law: 1. Choice of voice actor: It may be because the author or production team of the audio novel decided to change the voice actor to better match the image and characteristics of the character or to save costs. 2. Plot Requirement: It may be because the plot requires the voice of the actor to be changed to better promote the development of the story. 3. The copyright issue: It may be because the replacement of the voice actor involves copyright issues. The production team needs to communicate with the author of the original audio novel and obtain permission from the other party to replace the voice actor. It should be noted that the above is just a speculation based on my understanding of online literature. The specific situation may be different.