Pictures from the set of SBS's 'Running Man' revealed upcoming guest stars IU and Park Myung Soo.  

In the pictures, the cast and guest members are standing by a shopping complex as they film an episode of the popular variety program.  IU looks even smaller and cuter with her bright smile while standing next to the tall Lee Kwang Soo.  

People are curious as to what kind of funny entertainment these guest stars will have planned for the viewers.  

A representative of SBS said, "IU is currently filming for 'Running Man' along with Park Myung Soo as guests of the show.  We have not yet decided on when we will air the episode."

SEE ALSO: IU turns back time to the 1920's in 4th 'Modern Times' teaser

IU is a frequent guest on 'Running Man.'  She has been on the show in 2011 and twice in 2012.  Meanwhile, the singer is also preparing for her comeback sometime in October so stay tuned!