He is one of the smartest and is one of the Ace Trio. Although initially a weak player during the race missions, he later becomes one of the strongest players in the series, and is, along with Kim Jong Kook, considered to be one of the two main powers in the race missions. He is also often referenced to the color green throughout the show and is also known for his nickname 'Grasshopper' from his first television appearance. He is shown to have a closer relationship with a lot of the guests on the show, which he often boasts about to the other members. The main host of the show and known during the race missions for his escaping abilities. New members, Yang Se-chan and Jeon So-min joined the cast in April 2017 (episode 346). In April 2011, Song Joong-ki recorded his last episode and as of May, and has left the program to focus on his acting career but returned on episode 66 as a guest after leaving for almost half a year. Producer Jo Hyo-jin has stated that she is welcome to return at any time. In February 2011, it was revealed that she was only a long-term guest and has left the program. However, she has not been seen since episode 26. She officially joined the program in the sixteenth landmark (episode 18). Lizzy was also originally a guest for the eleventh (episode 13) and twelfth landmark (episode 14). She officially joined the program in the fourth landmark (episode 6) but was unable to attend until the fifth landmark (episode 7). Song Ji-hyo was originally a guest for the second (episode 2-3) and third landmark (episode 4-5). The original members of Running Man are Yu Jae-suk, Ji Suk-jin, Kim Jong-kook, Ha-ha, Lee Kwang-su, Song Joong-ki, and Gary.

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