This photo has been taken in 110910 when TVXQ! attended Lacoste SPRING 2012 Collection at Mercedes-Benz Fashion Week in New York.
The guy in the photo with them is called Wesley Sin, and according to his instagram bio he is a NYC x Taipei x Tokyo Writer/TV Host/ PR Professional.

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Credits:
Wesley Sin’s Instagram (wesley_sin),
Shared by TVXQ! Express