On the afternoon of October 17, 2013 in the MBC "Infinite Challenge" music festival's back stage, took place in Peace Park in Imjingak, Paju, Kyungkido, members prepared for their performances.

The festival introduced seven performances, including "How do you dul" (Yoo Jae Suk, Yoo Hee Yeol), "Guhmuhri" (Park Myung Soo, Primary), "Double Play" (Jung Joon Ha, Kim C), "Hyung Yong Don Jyong (Jung Hyung Don, G Dragon), "Rose Hagwan" (Noh Hong Chul, Rose Motel), "Seventy Fingers" (Haha, Jang Gi Ha and Faces), and "Gab" (Gil, BoA).

The production team estimates the number of audiences to be around 56,000 people. "Infinite Challenge" music festival had, over seven years, turned out to be a national festival. The collaboration between musicians and "Infinite Challenge" members in particular was a great success.

However, behind the stage seemed quite different. The 13 tents where performers were preparing for the show was silent. Yoo Jae Suk and Yoo Hee Yeul never came out of their tent and practiced singing, affirming Yoo Jae Suk's serious personality.

The music festival episode of "Infinite Challenge" airs on October 26.