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In Shanghai, a young woman (Lingyu Ruan) can support her baby boy only by turning to prostitution. In avoiding the police, the young woman comes under the inadvertent protection of a criminal boss who assaults her, then coerces her to work for him. Brutally forced to continue street walking, the woman nevertheless begins saving money secretly in order to send her son to a good school. When the boy is of age, his mother realizes her dream, until a teacher begins an investigation into her past. Wikipedia