유재석
"Running Man" was originally classified as an "urban action variety"; a genre of variety shows in an urban environment. The MCs and guests were to complete missions at a landmark to win the race. The show has since shifted to a more familiar reality-variety show concept focused on games. It has garnered attention as being the comeback program for Yoo Jae-suk, the main MC of the program, after leaving "Good Sunday"s "Family Outing" in February 2010.