The library administrator and the most intelligent person in the mental hospital. He is an old man with a straight back, white hair, and a face full of wrinkles like tree bark. His face has no eyes only a nose and mouth with sunken wrinkled skin where eyes should be, yet he can still look at people. He is in charge of the Key of Wisdom (blue key). Prometheus is arrogant by nature, hates ignorance and stupidity, and his greatest hobby is forcibly instilling knowledge in others. He considers all living beings ants and sees himself as close to God. He edited the Annals of the Mental Hospital. Despite his terrifying appearance, he showed a moment of kindness by picking up Gu Rong's fallen children's book. He was offended when called Blind Grandpa by Gu Rong.
