Question: Which South Korean-Chinese boy group debuted in 2012, featuring the South Korean singer and actor whose real name is Kim Jun-myeon?
Context: Byun Baek-hyun (born May 6, 1992), better known mononymously as Baekhyun, is a South Korean singer and actor.  He is a member of the South Korean-Chinese boy group EXO, its sub-group EXO-K and sub-unit EXO-CBX. Park Chan-yeol (born November 27, 1992), better known by the mononym Chanyeol, is a South Korean rapper, singer, songwriter and actor.  He debuted in 2012 as a member of the South Korean-Chinese boy group EXO and its sub-unit EXO-K. Kim Jong-dae (born September 21, 1992), better known by his stage name Chen, is a South Korean singer-songwriter and actor.  He is a member of the South Korean-Chinese boy group EXO and its sub-unit EXO-CBX, as well as S.M Entertainment's ballad group SM the Ballad. Kim Jong-in (born (1994--) 14, 1994 ), better known as Kai, is a South Korean singer and actor.  He is a member of the South Korean-Chinese boy group EXO and its sub unit EXO-K. Do Kyung-soo (born (1993--) 12, 1993 ), better known by his stage name D.O., is a South Korean singer and actor.  He is best known as a member and one of the main vocalists of the South Korean-Chinese boy group EXO.  Apart from his group's activities, D.O. has also starred in various television dramas and movies such as "Pure Love" (2016) and "My Annoying Brother" (2016). Exo (Korean: 엑소 ; stylized as EXO) is a South Korean-Chinese boy group based in Seoul.  Formed by S.M. Entertainment in 2011, the group debuted in 2012 with twelve members separated into two subgroups, Exo-K (Suho, Baekhyun, Chanyeol, D.O., Kai, and Sehun) and Exo-M (Xiumin, Lay, Chen and former members Kris, Luhan and Tao ), performing music in Korean and Mandarin respectively.  Exo's first album "XOXO" (2013), which contained the breakthrough hit "Growl", was a critical and commercial success, winning both Disk Daesang at the 28th Golden Disk Awards and Album of the Year at the 15th Mnet Asian Music Awards.  It sold over one million copies, making Exo the best-selling Korean artist in twelve years.  Subsequent albums and EPs continued with strong sales, and Exo were ranked the most influential celebrity by "Forbes" Korea Power Celebrity for the years 2014 and 2015.  They have been named "the biggest boyband in the world" by media outlets. Lu Han (born (1990--)20 1990 ), also known as Luhan, is a Chinese singer and actor.  He was a member of the South Korean-Chinese boy group EXO and its sub-group EXO-M, before leaving the group in October 2014.  That year, he was ranked the sixth most popular entertainment star in China by China National Radio. Zhang Yixing () (born (1991--) 07, 1991 ), better known by his stage name Lay (Korean: 레이 ), is a Chinese singer, songwriter, record producer, dancer, actor, model, author and voice actor.  He is a member and main dancer of the South Korean-Chinese boy group Exo and its sub-unit Exo-M.  He was first known after participating in the Chinese TV talent show "Star Academy" in 2005. Kim Jun-myeon (born (1991--) 22, 1991 ), better known by his stage name Suho (meaning "guardian" in Korean), is a South Korean singer and actor.  He is a member and leader of the South Korean-Chinese boy group EXO and its sub-unit EXO-K. Kim Min-seok (born (1990--) 26, 1990 ), better known by his stage name Xiumin, is a South Korean singer and actor.  He is best known as a member of the South Korean-Chinese boy group EXO, its sub-group EXO-M, and its sub-unit EXO-CBX.
Answer: Exo