WHAT DOES JOKER999 MEAN?

Among the musical sequences proven during the trailer characteristics Arthur and Harley dancing in front of a large "Resort ARKHAM" sign, which happens to be fashioned the exact same way as being the Bates Motel indication.悪戯とは知らずにブラントを口論の末に殺害してしまったという思い込みを利用され、D機関の