The picture of a man's back is a very deep and mature idea of a man. There may be many stories in his heart that prevent him from opening up. He can only show it to others. There may be a lot of pain hidden behind him, and her face is gaunt. This is probably a man's bitterness, but also a man's commitment and responsibility.
The Back is a reminiscence essay written by modern writer Zhu Ziqing at 1925.