I didn't know it was in Qingpu District. I know there are two darning places in Xuhui District. One is next to Longhua Tesco (opposite Christine's Bakery), and the other is next to the newsstand at the entrance of Hualian Jimaisheng in Yin Hui Square. I once darned a pair of trousers, and the effect was ok. The telephone number of the person in charge of Yin Hui Plaza is13816150379.