Where can I get the song?

I don't know where to find it in internet.
but if you come to thailand. Just ask for "Modern Dog" 1st album

The group is called Modern Dog and with a little searching, you can find it on soulseek (www.slsknet.org).

It's on their self-titled first album and if you can't read Thai, just look for the 3rd song.

Hope this helped.

Here's a link for the korean website:

http://www.citizendog.co.kr/

On the site you can find audio & videos to 3 songs from the film. Hopefully a korean dvd with english subs will follow.