Question: Which singer is South Korean, Mike Muir or Leo?
Context: KSLV-2, also known as Naro-2, is South Korea's second carrier rocket and the successor of KSLV-1.  This 3-stage rocket is entirely developed by the Korea Aerospace Research Institute (KARI), and planned to be launched into space in 2021.  All stages will use indigenously developed rocket engines.  The South Korean government is setting SpaceX as a role model, especially in making cheaper and reliable rockets for commercial launch service.  The goal is to launch a 1,500 kg payload into a 600–800 km low Earth orbit (LEO) and 2,600 kg into a 300 km LEO. "Therapy" is the second single by the group Infectious Grooves from their debut album "The Plague That Makes Your Booty Move...It's the Infectious Grooves".  The song featured Ozzy Osbourne singing the chorus.  A music video was directed by frontman and singer Mike Muir.  It received airplay on MTV's Headbanger's Ball. Ravi is a South Korean rapper, songwriter and producer, signed under Jellyfish Entertainment.  He began his career as a rapper in 2012 in the South Korean boy group VIXX, and later formed VIXX's first sub-unit VIXX LR with band mate Leo in 2015.  Ravi's songwriting career began with his participation in co-writing VIXX's debut single "Super Hero".  As of November 2016 with the release of "VIXX 2016 Conception Ker", Ravi has contributed to the writing and composing of over 46 songs recorded by VIXX.  Ravi is widely known for his participation of composing and songwriting rap portions for the group as well as lyrics and music. Sunmin (Hangul: 선민, "Katakana": ソンミン, born August 4, 1987) is a South Korean singer who speaks and sings in Korean, Japanese, and English.  She debuted in 2006, with the single "Keep Holding You," a collaboration with the Japanese R&B singer Toshinobu Kubota.  Her career was initially focused on the Japanese market, but her work became focused in South Korea from 2009 to 2010.  She also contributed to original soundtracks of South Korean television series "Master of Study" and "Gloria (2010 TV series)".  In 2010 to 2011, she was in the main South Korean musical production of "Jekyll & Hyde" as Lucy.  In 2012 to 2013, she reprised her role as Lucy in the South Korean national tour.  In spring 2013, Sunmin played Josephine in the South Korean production of "Arsène Lupin", the musical. Kim Tae-yeon, better known by the mononym Taeyeon, is a South Korean singer.  Her discography consists of one studio album, two extended plays (EPs), twenty singles (including four as featured artist), and three promotional singles.  She debuted as a member of South Korean girl group Girls' Generation in August 2007 and initially gained some popularity as a singer upon recording soundtrack songs "If" for "Hong Gil Dong" and "Can You Hear Me" for "Beethoven Virus" (2008).  She subsequently established herself as one of the most renowned vocalist on the South Korean music scene with further soundtrack recordings, notably "I Love You" for "" (2010), "Missing You like Crazy" for "The King 2 Hearts", "Closer" for "To the Beautiful You" (2012), and "And One" for "That Winter, the Wind Blows" (2013), all of which managed to enter the top ten of South Korea's Gaon Digital Chart.  Apart from soundtrack recordings, Taeyeon has also recorded duets with other artists, most notably "Like a Star" with The One and "Different" with Kim Bum-soo, which peaked at numbers one and two on the Gaon Digital Chart, respectively. Woo Ji-seok (Korean: 우지석 ; born May 11, 1990), commonly known as Taewoon or ₩uNo is a South Korean singer, rapper, songwriter, and record producer.  He is a former member of the South Korean boy band Speed and former member of the South Korean Coed group Coed School. Jung Taek-woon (Hangul: 정택운 , born on November 10, 1990), better known by his stage name Leo (Hangul: 레오 ), is a South Korean singer, songwriter and musical theatre actor, signed under Jellyfish Entertainment.  Known for his high-pitched, sharp, and clear vocals, Leo debuted as a member of the South Korean boy group VIXX in May 2012, and began his acting career in 2014 in the musical "Full House" as Lee Young-jae.  In 2015 he began his songwriting career, and with VIXX member Ravi formed VIXX's first official sub-unit VIXX LR. Cho Kyu-hyun (born February 3, 1988), better known mononymously as Kyuhyun, is a South Korean singer and musical theatre actor.  He is best known as a member of South Korean boy group Super Junior, its sub-groups Super Junior-K.R.Y., Super Junior-M and a former member of the South Korean ballad group S.M. the Ballad.  He is one of the first four Korean artists to appear on Chinese postage stamps. Michael Allen "Mike" Muir (born March 14, 1963) is the lead vocalist of the Venice, California crossover thrash bands Suicidal Tendencies, Los Cycos and the funk metal band Infectious Grooves.  He has also released several solo albums under his nickname Cyco Miko.  Muir's trademark is wearing bandanas, jerseys with the number 13, and hats with block style letters that read "Suicidal". The Gwiyomi Song, or Kwiyomi Song (귀요미 송), is a K-pop single by South Korean singer Hari and was released on February 18, 2013.  It was inspired by a gesture from South Korean rapper Jung Ilhoon of boy group BtoB.  The gesture is called 'Gwiyomi Player', that was popularized by South Korean variety show "Weekly Idol" through a segment called "The Aegyo Battle" (Battle of Cuteness) following Ilhoon's guest appearance on the show in October 2012.  The song went on to be a viral success and an Internet meme after Korean Media outlet "Sports Seoul" uploaded a clip of Hari performing the gestures and singing the song.  This video has since inspired many Asian netizens to upload their own versions onto the internet.
Answer: Leo