I'm sorry for the inconvenience.
I've checked all video files of the Hangul Video lessons but they are all working well.
If you click the icon, then the video will be downloading automatically. So, please click the 'Watch' link to see the video lessons if you clicked other links. If you click 'download' link or the quicktime icon it will be downloading on your 'My-document' folder.
If you still have the problem although you click the 'watch' button, please let us know what web-browser you use (also the version of the browser). It will be much helpful to solve your problem.
We are sorry for the inconvenience.