About Choi Si-won
Choi Si-won, known mononymously as Siwon, is a South Korean singer, songwriter, model, and actor, known for his work as a member of South Korean boy group Super Junior. Choi was a special representative for UNICEF Korea from 2015 to 2019, before being chosen as a UNICEF East Asia and Pacific Regional Office ambassador in November 2019. Choi Si-won (Korean: 최시원; born April 7, 1986), known mononymously as Siwon, is a South Korean singer, songwriter, model, and actor, known for his work as a member of South Korean boy group Super Junior. Not long after Choi's first television appearance, SM Entertainment released an announcement that he would debut as one of the twelve members in a boy band. A few months before the debut of Super Junior 05, Choi made his first media appearance with bandmate Han Geng as one of the runway models in a fashion show by Bum Suk. Choi debuted as part of 12-member rotational project group Super Junior 05 on November 6, 2005, on SBS' music program Popular Songs, performing their first single, "Twins (Knock Out)".
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.