A creature named Jack, who comes to those people and animals who feel negative emotions (sadness, anxiety, hatred, etc.). He feeds on these emotions. Jack's abilities include calming the person he came to: if he wishes, then his appearance alone will be enough to calm down a little (sometimes he uses the most effective remedy, namely 18+) Jack himself looks like a young man with white hair, although he is already several hundred years old. He also feeds on negative emotions.