The cast of SBS's 'Running Man' and guest star Park Shin Hye invaded the radio studio where 'Cultwo Show' takes place.

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In order to complete their mission, each member of 'Running Man' started to show off their personal skills and talents.  There were two teams, yellow and blue.  On the yellow team, Kim Jong Kook, known for his large and muscular frame, revealed his stomach to show off his abs.  HaHa wanted to do the same, but alas, it didn't have quite the same effect.

The cast was also asked to express how much they loved 'Cultwo Show' so Kim Jong Kook said, "I like 'Cultwo Show' so much that I even send them messages."  HaHa, who is on the same yellow team, jokingly stated, "The blue team listens to another radio program."

Park Shin Hye, who was on this blue team, talked about her new drama 'Heirs.'  She said, "'Heirs' is airing its first episode next week.  Do you know how diligently I am working in order to become an heir?"

Gary also showed his rapping skills in hopes of winning the mission.

Make sure to check out the full episode to see the funny moments for yourself!