Despite being former castmates in the variety show "Running Man," Yoo Jae Suk found out the hard way how difficult it was to get in touch with Song Joong Ki. Has this been because Song Joong Ki has become a famous star since "Descendants of the Sun?" Yoo Jae Suk could not stand it so he called up Joong Ki's best friend Lee Kwangsoo to find out why the star wasn't picking up his calls.
According to a report by All Kpop, Yoo Jae Suk, Kim Yong Man and Seok Jin were given the task of contacting three high-profile celebrities -- Jo In Sung, Gong Yoo and Song Joong Ki in an episode of "Happy Together 3." The three actors were selected by the viewers as the top celebrities they want to see on the show as guests.