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The video is from Big Bang`s official YouTube channel `BIGBANG`.
Following their comeback in February 2012 with their 5th mini album `Alive`, they released a special edition album `Still Alive` with 5 new songs. The title track is `Monster` and I posted the music video above. If you like their music, please support them by purchasing their music. The digital album and individual songs are available through iTunes.
Source link: http://m.youtube.com/watch?v=btDd9rOlc2k