SS501 Members Profile and Facts SS501 debuted in 2005 under DSP Entertainment (now DSP Media) with the members Kim Hyun Joong, Heo Young Saeng, Kim Kyu Jong, Park Jung Min, and Kim Hyung Jun. The full group went on hiatus after leaving DSP Media in 2010, but their subunit Double S 301 continues to release music. SS501 Fandom … Continue reading SS501 Members Profile