This episode there are three teams. Old idol, new idol, and running idol. Jong kook with the old idol and haha with the new idol, so they rest member of runing man became running idol. Also in this episode ji  hyo prove her lucky side when playing a game that you must guess how many rocks in the gueser hand, and ji hyo guess them all. In the end they must solve a mistery with line and sides to open a giant door to escape. They must solve that with the hint they got when winning the previous game