After word got out that SS501's�Kim Hyun Joong would be making a guest appearance on SBS's 'Running Man,' fans rushed to various online communities to get a behind-the-scenes glimpse of the singer/actor as well as any information pertaining to the upcoming episode. Well, it appears that fans will have to wait another week as it is aired to schedule next week! Until then, let's take a look at the teaser for the much anticipated episode! The teaser starts off with an ominous voice stating, "I was originally the running man...until I answered the phone call." A narration clip of Kim Hyun Joong then hints that the upcoming episode will take walk--or in this case, run--down memory lane and transform into the popular yet canceled variety show Xman. Kim Hyun Joong states, "I asked them to take on the role of 'Xman.'" In addition, the text in the video reads that Kim Hyun Joong will have the opportunity to choose one cast member to become a spy. Watch the teaser below! Thanks to Jae Ryuu for the tip!