In April 1955, 920 young women from Shanghai, dressed in green military uniforms and organized into four detachments, boarded a westbound train. Among the female soldiers heading to the Tianshan Mountains, this was a special group. Few people knew that these young women were former prostitutes who had just left the "Shanghai Women's Labor Reeducation Center." With a long whistle, the train slowly departed from the familiar Huangpu River, heading towards an unfamiliar yet yearned-for destination.