Via tokyohive: On July 4th, TVXQ unveiled�a MV preview from their new single, "I Don't Know" through a broadcast on national Japanese television. This video clip also features some short behind-the-scenes footage from the recording set; it was revealed that the boys filmed the MV without the comfort of air-conditioning. Still, the results look to be quite "hot", so check out their MV preview below!
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