Tesco and E-Mart used re-engineering strategies in South Korea by leveraging technology and mobile devices. Tesco launched a virtual supermarket in subway stations using QR codes on posters that customers could scan to order groceries for delivery. E-Mart responded by deploying "flying stores" drones around Seoul that promoted their mobile app for online orders. Both companies saw significant increases in online and mobile sales, demonstrating how re-engineering processes through technology can drive innovation in retail.