In America, we're used to a "have it your way" mentality. We customize everything, from our houses, to our weddings, to our hamburgers. In Korea, that is often not the case. It can be very difficult to custom order even something as simple as a latte. The cartoon below is what I can only assume is the reason for that.
*note: once again, the Korean has been translated for you. The conversation exchanged in the last frame is NEVER that easy.*