Joo Sang Wook and Yang Dong Geun of the movie "The Punisher" joins the "Running Man" cast for this week's fun-filled episode.

Wearing Crayon Pop-like helmets, the cast and guests of "Running Man" ran for the chance to get keys that would unlock them from being imprisoned. At the same time, fans and viewers are treated to the comeback of the highly popular "bells hide and seek" racing game, and Kim Jong Kook even showcased a ferocious roar while running for the win.

This week's team up has five members against four, with the chasing team getting the handicap. With a rule which states that the chasing team would lose a member each time the other team acquires a key, only two members would survive and win the game.

Meanwhile, "Monday Couple excite fans with their conversation about marriage. While Song Ji Hyo was trying to unlock Gary's helmet with her key, the ever hilarious Haha made a comment and said, "It the key fits, then why don't the two of you get married."

Song Ji Hyo answered that she wants to try it out first, to which Haha answered teasingly, "She said that she wants to try getting married first."

Gary defended Song Ji Hyo by saying, "Personally, I don't think it's a bad idea." When the key did unlock Gary's helmet, he celebrated by telling Song Ji Hyo jokingly, "I'll be searching for wedding halls, and after we finish up here, let's meet up," causing everyone to laugh.