The true identity of the boss of the Black Organization has always been a hot topic among fans. Among the significant supporting characters, Professor Agasa, who often appears harmless, has also faced suspicions from many friends. To address this, Gosho Aoyama arranged a scene in the conclusion of the long episode A Dual Mystery on a Full Moon Night where Professor Agasa rushes to rescue Conan upon hearing gunshots, aiming to absolve him from suspicion.

Unfortunately, this move wasn't embraced by fans, leading to more conspiracy theories and analyses. Gosho Aoyama, receiving letters questioning this aspect, found it both amusing and exasperating, remarking on the vast imagination of readers and viewers. It's noteworthy that Professor Agasa's full name is “Agasa Hiroshi” (literally translated as "Professor Agasa"), derived from the Japanese pronunciation of Agatha Christie, the renowned English crime writer, and the mad scientist Dr. Kim from the science fiction mysteries penned by Japanese author Sano Shōichi.