EXO is a South Korean-Chinese boy band produced by S.M. Entertainment that debuted in 2012. EXO comprises twelve members who are separated into two subgroups. EXO-K and EXO-M. The former releases music in South Korea, while the latter promotes music in mainland China. EXO’s name was taken from EXOPLANET, a term referring to planets outside of the Solar System.
Oh Se Hun (Korean: 오세훈; Hanja: 吳世勳), more often credited as simply Sehun was born on April 12, 1994 (age 19) in Seoul, South Korea. Sehun was scouted by a casting agent on the streets when he was twelve, and was finally cast into S.M. Entertainment in 2008, after going through four auditions in two years. On January 10, 2012, he was introduced as the fifth member of Exo. Sehun made a brief appearance in Girls’ Generation-TTS’s music video for “Twinkle” alongside fellow members Baekhyun, Chanyeol, and Kai. He graduated from the School of Performing Arts Seoul in February 2013. Sehun guest starred in the second episode of the 2013 sitcom, Royal Villa, with Chanyeol.
(Credits goes to Wikipedia and SM Entertainment)