After Lee Sang Yoon and Yuk Sungjae left the show, they invited Ong Seong Woo to be the temporary member for one outing (2 episodes) and now we have a new temporary member on the show.
Lee Jin Hyuk will be next on episode 114. Jin Hyuk is a member of UP10TION from TOP Media but gain attention from public after his appearance in Produce X 101 as one of the trainee and finish off Top 15.
The current ongoing drama, Find Me in Your Memory is his first acting role. Portray Jo Il Kwon, a junior reporter in the broadcasting station.
Source (1)