On a rainy night, the baby found a black stone with the word "Yuan" engraved on it.
The dean said: The place where you come from is not the place, it is the words carved on the stone.
Shen Yuan stayed in the welfare center until he was sixteen, and learned to disappear in the crowd. She moved into the Yongji Old Book Shop and built an "unclaimed" grid for abandoned books—someone gave them out but no one took them up. Like her.
Until that day, a man opened the door and read out the note she wrote on the title page: "A book will never be unclaimed and uncrossable at the same time."
He said: "I am a person who swam from the other side."
He saw her. Then disappeared.
When the abyss begins to look back, can the abandoned person become where he came from?
Concept: a black stone with the word "Yuan" engraved on it, an old bookstore containing "unclaimed" books. The abandoned person spends his whole life searching for where he came from, and finally discovers that when he looks back from the abyss, the only one who claims him is himself.