If you watched the latest episode, the ending hinted at Gary's return appearance with, "And 'Running Man' had a beautiful farewell with Gary.... that's what you thought, right?" Then Gary's face popped up with the caption, "Please don't. Leave me alone. This is too much." 

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On November 11, producer Lee Jin Hwan of 'Running Man' explained the mysterious ending by stating, "As seen on last week's preview, Gary will be appearing on the November 13 broadcast. We did bid him farewell but goodbye isn't forever so we were clingy to the very end. You can think that Gary is the first guest in the first episode of the remaining 5 member-cast without him. He was given a secret mission and I hope you will check it out on the broadcast."

This means one more week with Gary! Make sure to watch 'Running Man' this Sunday!