You can read about this woman and in my article in The Jeju Weekly. She's playing an ocarina. I've never actually seen one before, but it seems that I've heard of it. I thought it was a really cool thing because it seemed like a simple instrument to play. When we were in elementary school back in the states, we played the recorder, but the ocarina seems so much more practical because of its size. The round shape puts the ocarina into a small and managable instrument that you can take wherever you want to go. It made for a really lovely surprise to listen to while I was hiking.