Yu Jae Seok was terrified while Kim Jong Kook only thought about winning! #fyp #runningman #yujaeseok #yoojaeseok #kimjongkook #haha #yangsechan #songjihyo #jiseokjin #jisukjin #jiyeeun #kvariety #kvarietyshow #koreanvarietyshow #koreanvariety #kocowa