This film was shot between 2014 and 2019 in the town of Zhili, a district of Huzhou City in Zhejiang province, China. Zhili is home to over 18,000 privately-run workshops producing children's clothes, mostly for the domestic market, but some also for export. The workshops employ around 300,000 migrant workers, chiefly from the rural provinces of Yunnan, Guizhou, Anhui, Jiangxi, Henan and Jiangsu.