Si Won

Real Name: 최시원 Choi Siwon

Stage Name: 시원 Siwon (official) | Shiwon (unofficial)
Chinese Name: 始源 Shi Yuan
Date of Birth: February 10, 1987 | Real: April 7, 1986 (Seoul, Korea Selatn)
Height: 183 cm
Weight: 65 kg
Blood Type: B
Hobbies: singing, dancing, watching movies, Taekwondo, Chinese (language), playing drums
Aliran Musik : K-Pop, Mandopop

Jenis Suara : Bariton

Alat Musik : Piano, Drum

Aktif di SJ : 2005 s/d sekarang

Grup: SM Town, SuJu, SuJu M

Profesi: Penyanyi, Penari, model

Website: onlysiwon.smtown.com