Zhao Lan, a middle-aged garment factory worker with exceptional sewing skills and an unyielding spirit, stands up to the unreasonable demands of an overseas-trained designer, an industry-wide blacklist imposed by powerful capital, and foreign companies' monopoly over industry standards. Leading a group of grassroots workers, she uses traditional hand-sewing techniques to overcome the challenges of stitching advanced protective fabrics. Together, they transform a dilapidated small factory into the formidable brand Iron Thread Garments. By establishing standards through craftsmanship, she wins back the dignity and confidence of ordinary working people.