I'm trying to translate the song on last one to English so I can sing it sometime. It's just so hard. I'll get it eventually... But yes, not many flash movies make me cry. This was one of the few that did.
I remember watching that years ago, but I didn't know there were more! They're all really good (although I still like the first one the best).
Incidentally, I saw the official music video for that song years ago when I still had cable, and so could watch Korean music videos. I remember it being very funny. I wonder if I can find it on Youtube or something... And here it is! Ain't the internet grand?