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The video is from Wonder Girls` official YouTube channel `wondergirls`.
Wonder Girls is a popular girl group in Korea and the members are Sunye, Yeeun, Yubin, Sohee, and Hyerim. Recently they released the Japanese music video for their 2008 hit song `Nobody` and it`s completely different from the original version. Although I liked their songs `Irony` and `Tell Me`, I think it`s this is will always be my favourite song from the Wonder Girls.
Source link: http://www.youtube.com/watch?v=378AnxAve9Y