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It seems that Ar is definitely not the murderer, but rather some kind of investigator. This means that Lizard is also playing for the city. I don't have any more thoughts for now.
"Flower of Lotus" is a good argument for Pandora, but it's still just one clue from the picture, which the author could have used to represent anything. Given the large amount of text, we need to look for either additional evidence from the mafia (since there was no murder) or accuse Revan as the only suspect.