Which South Korean reality-documentary show was Oh Jong-hyuk a former cast member of?
Oh Jong-hyuk Oh Jong-hyuk (; born February 16, 1983) is a South Korean singer. He debuted as a member of Click-B in 1999, and made his debut as a solo artist in September 2006 with the album ""Issue"". He was a former cast member in the variety show "Law of the Jungle". In September 2013, T-ara's management Core Contents Media released an official statement confirming that He and Soyeon of T-ara have been dating for the past 3 years. He appeared on MBC King of Mask Singer in 2015 (Episode 35 and 36 with the stage name "Lonely Man Leon").
Ko Ji-yong Ko Ji-yong (born July 1, 1980) is a member of Sechs Kies, a South Korean first generation K-pop idol dance group which disbanded in 2000 but reunited in 2016. Unlike most of the other members, Ko left the entertainment industry and started his own company. He made his first television appearance in years when he appeared at Sechs Kies' reunion special on "Infinite Challenge". Due his family and work commitments he did not sign a contract with the group's new label YG Entertainment or promote with them as a performer but is considered to be part of the group. Since January 2017 he and his son have appeared on the reality show "The Return of Superman".