|Position||Leader, Lead Vocalist|
|Also Known As||Leader Onew, Onew Sangtae, Dubu, Tofu|
|Specialties||Singing, Piano, English, Chinese|
He was born in the city of Gwangmyeong , Gyeonggi-do. He was discovered at the 2006 S.M. Academy Casting. Onew collaborated with Lee Hyun Ji, former member of the project group Banana Girl, for his song "Vanilla Love" and with label-mate, Jessica of Girls' Generation for the song "Il Nyeon Hu" (One Year Later).
Onew has made Cameos in several dramas, and is currently considering starring in the upcoming drama, Descendants of the Sun.
Onew also starred in various musicals starting in 2010, debuting in the musical Hyeongjeneun Yonggamhaetda (Brothers Were Brave) alongside singer Lee Ji-Hoon. He then starred in the Korean production of Rock Of Ages playing the lead role, Drew.