Stage Name: U-KNOW / U-Know YunHo (유노윤호 or 瑜卤允浩)
Real Name: Jung Yun Ho (정윤호)
Date Of Birth: 6th Februray 1986
Birth Place: JunNam Heights
Blood Type: A
Height: 184cm
Weight: 66kg
Hobbies: Listening to music and singing
Talents: Singing, and dancing.
Band Position: Bass Vocals, Leader
Awards:
S.M. Entertainment's 1st Best Youth Competition
Best Dance Award