In the early 1960s, Gu Feixue, a nurse who lived in a rental house in 43 Ziyi Lane in Suzhou, disappeared all of a sudden, leaving three-month-old boy-girl twins, Bayue and Shiwu, to a Yangzhou nanny named Adan. For fear that the kids might be hurt, Adan secretly moved away from Ziyi Lane and brought up Bayue and Shiwu with painstaking care. Thus, it was perfectly justifiable for her to be called Gu’s Nanny at Fengmenheng Street. Eighteen years later when a letter was received, their upside-down master-servant relation was finally reversed. Adan, with her unremitting efforts, overcame the hardships of life and demonstrated the power and beauty of mother’s love with the most primitive ruler of measuring.