Kim Jang Hoon and PSY are currently promoting the Red Devils for the 2010 World Cup, but it's been reported that they had participated in the April 1st taping of MBC program Quiz To Change the World. Kim Jang Hoon's been taking a break from his rock ballad singing and doing charity work while PSY was discharged from the army in 2009 and has slowly been working on his return to the k-pop scene. The show's PD, Park Hyun Suk, revealed that the two had promised to appear on the show together as he said, "The two have fulfilled their promise to appear on the show together. The two really lived up to expectations and put on a great show for us." This episode of Quiz To Change the World will air sometime in mid-April.