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tesco homeplus opened a virtual grocery store in a south korea subway station, where users shop by scanning QR codes on their smartphones in a campaign designed by the seoul branch of advertising agency cheil, tesco homeplus supermarket opened last fall a virtual grocery store in a south korea subway station, permitting users to shop using their smartphones. a large, wall-length billboard was installed in the station, designed to look like a series of supermarket shelves and displaying images and prices of a range of common products. each sign also includes a QR code. users scan the code of any product they would like to purchase, thereby adding it to their online shopping cart.