Rupert Schneider was the name of a medieval European German aristocrat who died from the judgment of a furious mob due to his corrupted moral logic along with his sexual orientation and tendency to collect the young men he attracted as his sex slaves by force.
Until before he and Indra managed to get this building and remodel it into a cafe building like now, Rupert's spirit can be said to be the most annoying spirit. Both from the explanation of the property agent who offered this building to him and Indra and the community of spirits who live in this building, all of them complained about the tendency of disturbances that emerged from Rupert Schneider, who liked to possess young people who passed by this building and attracted Rupert's attention.
And with days of hard work, he finally succeeded in sealing Rupert's ability to possess other human bodies when the initial renovation of this building began.