Probably as an ordinary and honest person, in this era of turbulent thoughts, the protagonist, after reading various interstellar travels between humans and insects, Marshal Emperor, black hole wormhole and male A female A male O female O... BCDEF, connected with reality and became very curious about the future development, including language, technology, humanities, geography, food, beauty, gender, etc., So he got the opportunity to take a day trip in the future in his dream.
Note: In a sense, how can this not be regarded as a kind of old-fashioned science fiction?
Purpose: Don't do to others what you don't want others to do to you, respect and wish for a happy marriage for a hundred years