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Heo Young Saeng (Korean: 허영생; Hanja: 許永生; Japanese: ホ・ヨンセン)
* Birthday: November 3, 1986 (1986-11-03)
* Position: Main high vocal
* Past experience: DJ for SBS's "Youngstreet" Radio (from June to August 2006), MC Mnet Countdown.
* Talents: Singing, Dancing, Piano
* Notes: Heo Young Saeng was a former trainee under SM Entertainment, he left to join DSP Entertainment. He is close to many TVXQ and Super Junior members, notably Hero Jaejoong, Yesung, and Choi Siwon. He is a member of SS501 subgroup.