유재석
Kim and Haha are regular cast members on the variety show "Running Man", which started airing in 2010, and they have been called its favorite "duo." Although Yoo Jae-suk is the star of the show, Kim and Haha have been written of as the "spice" of the show, with references to Kim's "boyish likeability, upbeat personality and masculinity" and Haha for "his insatiable sense of humor and free spirit," and together are called "the musical duo."