JYJ's Jaejoong, BIGBANG's G-Dragon and T.O.P, ZE:A's Siwan, actor Joo Won, model-actor Lee Soo-hyuk, and SNSD's Yoona were selected by the producers of Roommate to star in the show's filler season. 3 months after, their natural and funny conversations, blossoming friendship, and skinship were huge hits and the talk of the town. Due to popular local and international demand, Running Man decided to invite them for a day of play and fun. What's going to happen? Find out. :)