On the most recent episode of the MBC entertainment program 'Infinite Challenge,' which aired on December 20, 2014, singer Kim Jung Nam mentioned his old partner Kim Jong Gook while singing a song in front of the Infinite Challenge members. On this day's episode, the Infinite Challenge members recruited 1990s pop stars including Kim Jung Nam of the 1990s boy group Turbo. Kim Jung Nam sang his old Turbo song in front of the Infinite Challenge members. While singing the song, Kim Jong Gook's part came out and he said, "You know that this is originally Jong Gook's part, right?" and made the Infinite Challenge members laugh. In related news, on the most recent episode of the popular MBC entertainment program 'Infinite Challenge,' called 'Saturday Saturday Is a Singer,' the Infinite Challenge members recruited popular singers from the 1990s and hosted a stage performance, showing popular songs from the 1990s. The MBC entertainment program 'Infinite Challenge' is one of the popular, long lasting entertainment programs in Korea. It features the Infinite Challenge members Ha Ha, Park Myung Soo, Yoo Jae Suk, Jung Joon Ha, and Jung Hyung Don.