So I found this video and it was about Suho and Exo-K. 

It was said by the staff members that Exo-K was playing the Truth and Dare game, so Suho had to take off his coat.

This video shows Suho taking off his coat and each of the Exo-K member's reactions.

This video do not belong to me. It belongs to Eunmi24.

http://www.youtube.com/watch?feature=player_embedded&v=hSdTu2UDEcI