I have no native speakers to ask anymore so I come to my friends here for knowledge. My understanding is that Anyong ah say yo is the less formal way of saying "Hello" & the later is more formal. Am I correct? My 1st instructor (a Korean) taught us the former when we bow into the dojang to address him. Given my current understanding that it's a less formal address, I find this odd. And from the TV show "Arrested Development" they thought the kid's name was Anyong, but the narrator said it was the way to say Hello in Korean. Is it a shortened version like "hi."