Basically, the backlit billboards emulate the aisles of Home Plus (the British grocer's Korean store), such that otherwise-idle commuters could shop using their smartphones, such that their groceries would arrive at their doorstep at the same time that they would.
Well, if Tesco's pilot program in Seoul provides a glimmer of hope for more productive downtime, not to mention one of the more practical applications of QR codes I've seen: Basically, the backlit billboards emulate the aisles of Home Plus (the British grocer's Korean store), such that otherwise-idle commuters could shop using their smartphones, such that their groceries would arrive at their doorstep at the same time that they would.
