Left image: a poster suggesting a sale of 50% off on a particular day
Right image: a post posted by a social media account, named as OnlineShop, 3 days ago showing an image of a poster suggesting a sale of 50% off on a particular day
The image is ironic, because the poster of sale at a store is posted 3 days ago on a social media account which means the sale which was for only one day has become over