The little sister (played by Guo Keyu), who has been separated from her husband for many years, escapes from the past, is far away from her hometown Cangshan, and while doing housekeeping work in Shanghai, she also takes care of her Alzheimer's mother and her rebellious son. When she experienced the hardships of life in a foreign land, she chose to return to her hometown Cangshan, but then she found that her hometown had changed