Question: S.M. The Performance, is a dance project group, formed by S.M. Entertainment in 2012, The group consists of members of other groups of S.M., including which South Korean singer and actor, a member of the South Korean-Chinese boy group EXO and its sub unit EXO-K, better known as who?
Context: 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. EXO is a South Korean-Chinese boy band produced by S.M. Entertainment.  Separated into subgroups EXO-K and EXO-M, respectively performing music in Korean and Mandarin, the band debuted on April 8, 2012 with the single, "Mama".  Prior to debut, various members of the band have modeled in music videos performed by senior S.M. Entertainment artists. Overdose is the second EP by South Korean-Chinese boy bands EXO-K and EXO-M.  It was released by S.M. Entertainment and distributed by KT Music on May 7, 2014 in Korean and Chinese version.  It is preceded by their special EP album "Miracles in December" that was released in December 2013.  This is the final release that includes members Kris and Luhan before they left the group and filed lawsuits against S.M. Entertainment requesting contract termination. 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. The discography of the South Korean-Chinese boy band Exo consists of four studio albums, five extended plays, and twenty one singles. Exo was formed by the Korean entertainment company S.M. Entertainment in 2011, and formerly consisted of twelve members separated into two sub-groups, Exo-K and Exo-M, releasing the same music simultaneously in both Korean and Mandarin in South Korea and China, respectively.  The group's first release, the extended play "Mama", was released in April 2012.  The album topped Korean music charts on its release. S.M.  The Performance is a dance project group, formed by S.M. Entertainment in 2012.  The group made their first appearance on "SBS Gayo Daejeon" in December 2012.  The group consists of members of other groups of S.M., the first formation being composed of U-Know , Eunhyuk , Donghae , Taemin , Minho , Kai e Lay . 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. 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. 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). 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.
Answer: Kai