Detective Gao Nut: Serial Murder Case

On June 6, 1953, one year after Gao Nuts solved the park tragedy, a serial murder case broke out in the small town. After Gao Nuts' investigation, it was found that the murderer's methods of committing crimes were imitated from unsolved cases around the world, such as the Jack the Ripper case, the Black Dahlia case, etc. After in-depth investigation, Gao Nuts found that this case became more and more confusing. So, who is the murderer?