The reason, the group cites, is to focus on their music instead of developing their television personas. Surely there must be some other reason triggering the group to take such a drastic, and some argue, rash decision.
Moreover, to accommodate negotiations with Kang Gary and his team, the cast and crew of Running Man have shifted their usual filming days on Monday, initially supposed to fall on 24 - 25 September, to later in the week.
Running Man production crew has said that this will not have an effect on broadcasting schedules, so Running Man fans need not fret.
Kang Gary returns in Episode 114.