Haha (하하), is a South Korean singer, variety show host and member of RGP. He is best known for being in the sitcom, Nonstop and for co-hosting two popular variety programs, MBC's Infinite Challenge and SBS's Running Man. He has also hosted his own show, titled "Ya Man TV" on Mnet in 2015. He released an independent studio album called "Ha Dong Hoon" on April 30, 1997.He later became a trainee for Seoul Records and debuted as a singer and rapper in 2001 with boy band, Z-kiri. Despite excessive promotion, Z-kiri failed to get popular and was quickly disbanded.