Choi Si-won (born April 7, 1986, although his father did not register his birth until February of the following year), sometimes mononymously credited as Siwon, is a Korean pop singer and actor. He is a member of super boy band Super Junior and is part of its subgroup, Super Junior-M. Siwon is best known for his role in the 2006 Hong Kong historical action film A Battle of Wits as the young prince, Liang Shi. He is also one of the first four Korean artists to be on Chinese postage stamps. Read more on Last.fm