Cool project by Wonsuk Chin, who is a film director I met a few times while in Seoul. From his post at YouTube:
"Hi, my name is Wonsuk Chin and I'm a filmmaker currently based in Seoul. I just directed and shot a music video with an iPhone 4 and I believe it's Korea's 1st iPhone 4 music video.
The song "Garosougil" (the name of the street in Seoul) is written and sung by Yang Jinseok, also a renowned architect in Korea. We had fun making it and I hope you enjoy it, too.
If you have any questions or comments, please feel free to reach me @wonsuk on Twitter."