Though Yoo Jae Suk known to be just a witty MC of Korea, it looks like he's making his moves to become more masculine. On the episode of Infinity Challenge that aired on the 19th, the members continued shooting for their 2011 calendar. For the month of April, they went for a "tough guy" theme. The members all transformed into "bad boys" and posed for the camera. Yoo Jae Suk wore a very sexy outfit that showed off his muscle-y body. He was all greased up and it looked like not one part of his body was fat. He works out quite a lot so this isn't too surprising.