After spending a boring time in the fairy world, the old fairy Jinse came to the human world for some reason, thinking that the human world might be interesting, and stayed there for several decades. Later, she found that she could not go back. She seemed to have forgotten important things. After discovering interesting inventions in the human world, she decided to take her time. After all, she was not alone in the fairy world.
However, some people and things are not like him. The only eternal thing in the world is the past. She gradually understands this better than anyone else.