The writer Hao Xiaohui has written such a passage: "The past time is like the sand in the hand, the broken out is already relieved, leaving is stained with the hands of the old." A period of memories, is the mark of growth, but also reflects the change of time.

"Rolling Iron Ring" is a game that Chinese children often played before the 2000s, bearing the memories of many people. The story goes from a little girl's childhood to her old age. The relatives and friends around are gradually leaving, and everything around is also changing.