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Birth nameKim Jung-tae
Also known as
  • Jung Kyun
  • Rocy
Born (1985-01-11) January 11, 1985 (age 35)
South Korea
Years active2005–present
Associated acts
  • Lucky J
  • Louis.B
  • Fresh Boyz
  • Romantic City
  • Diamond Tribe
Korean name
Revised RomanizationGim Jeong-tae
McCune–ReischauerKim Chŏngtae

Kim Jeong-tae (Hangul: 김정태; born January 11, 1985),[1] better known by the mononym J'Kyun (Hangul: 제이켠), is a South Korean rapper and singer.


Kim first entered the hip-hop scene in 2003, under the name Jung Kyun. After dropping out of Dongguk University he joined a hip-hop crew known as Diamond Tribe with members: JuNi, Freestarr, LEGO, and Marco and Lugar of Mo'Real, who performed frequently at Club Belly in Apgujeong-dong. He began work on his debut album in the Summer of 2003, with producers: Marco and Lee-ryung. The extended play, Just Clap, was finally released in November 2005.[2]

In 2008, Kim officially changed his stage name to J'Kyun after his Diss track directed at San E went viral.[3] His activities began to gain more attention when he joined the music group, Romantic City and produced lyrics under the name Rocy. He withdrew from the group in late 2010 just before the release of a new album.[4] Shortly after this he became part of a group by the name Fresh Boyz, composed of members: Ceejay, Nolbu, Kwon Sa-jang and himself, although he left the group in mid 2011 for personal reasons.[5]

In early 2010 J'Kyun announced that he had signed with BigDeal Records, where he went on to release his first studio album Re Birthday in May of the same year.[6] Some songs on the album, namely "Mom" and "Back Then" were inspired by his mother, who had recently died. While the track "I Go" became known controversially, with negative lyrics surrounding big companies such as YG Entertainment, SM Entertainment and JYP Entertainment.[7] In October J'Kyun announced that he had decided to leave Bigdeal Records, and that he was involved in a project with vocalist Kuan, currently preparing an underground EP. The project team began activities in November 2010 under the name Louis.B and released two digital singles.[8]

In 2011, after J'Kyun had parted ways with Romantic City and Fresh Boyz, he joined Brand New Music where he began preparing a new album, but later left the label in 2012 and moved to Romantic Factory (a subordinate of Romantic City).[9] Here he performed an internet radio show, "Ladies Radio", through his Facebook page, he used this platform to release songs that he had personally worked on, in particular, "Fantastic Soonkyu" and "Twinkle Soonkyu" which expressed affection towards Sunny of Girls Generation.[10]

In April 2012, J'Kyun released his second extended play These Days including the single "Hot MC" featuring Zico of Block B, the EP peaked at number 70 on the Gaon Chart.[11] In May he was selected as the Korean representative of the global music jacket, "Music Matters" in Singapore.[12]

In 2013, he participated in Mnet's Show Me the Money 2 as a contestant, starting as a "Meta Crew" member, but later joining the "D.O. Crew" before finally being eliminated in the later stages.[13]

In 2014, J'Kyun joined YMC Entertainment where he, Jessi and J-Yo formed Lucky J.[14] The group released two singles and featured in an official drama soundtrack before disbanding in August 2016.[15]

In 2019, he participated again in Show Me The Money 8 as the masked rapper, Cox Billy. He was eliminated from the show during the 1:1 crew battle against Mckdaddy.


Studio albums

Title Album details Peak chart positions Sales
Re Birthday
  • Released: May 11, 2010
  • Label: BigDeal Records, InPlanet Music
  • Format: CD, digital download
"—" denotes releases that did not chart.

Extended plays

Title Album details Peak chart positions Sales
Just Clap
  • Released: November 1, 2005
  • Format: CD, digital download
These Days
  • Released: April 13, 2012
  • Label: Romantic Factory, CJ E&M
  • Format: CD, digital download


Title Year Peak chart
Sales (DL) Album
"New Shit" 2005 N/A Just Clap
"Cool Chuck" (쿨한 척)
feat. Marco & Outsider
2010 Re Birthday
"These Days" (요즘그냥)
feat. Soul King
2012 These Days
feat. Oh Su-min
"Let's Go to the Movies" (영화봐요우리)
feat. Oh Su-min
Non-album single
feat. Oh Su-min
2013 98 Show Me the Money 2
"Ponytail" (포니테일)
feat. Ken of VIXX
93 Non-album singles
"Epilogue" (에필로그)
feat. Rex.D
"Blue Sweater" (블루 스웨터)
feat. Park Ui-sung
2014 The Voice of Korea
"Burnt Up"
feat. King Kong
Non-album singles
"Cool Down" (식다)
"Bad X" (나쁜 X)
feat. Jooheon of Monsta X, Konsoul
"Body Lotion" (바디 로션)
feat. JYO
"Soaking" (흠뻑)
feat. Cherry Coke
"Polaroid" (폴라로이드)
feat. Tarin
"—" denotes releases that did not chart.


Year Title Other artist(s)
2011 "Local Player" (로컬 플레이어) Bizniz feat. Joosuc
2016 "Not Just Friends" (남녀 사이에 친구가 어딨어) Sugarbowl



Year Network Title Notes
2013 Mnet Show Me the Money 2 Contestant[20]
2016 Show Me the Money 5


  1. ^ "제이켠 프로필" (in Korean). Naver.
  2. ^ "정견 첫번째 EP [ Just Clap ] 보도자료 및 미리듣기" (in Korean). Hip-Hop Playa.
  3. ^ "'J'kyun' 이 'San E' 에게 보내는 메세지" (in Korean). Hip-Hop Playa.
  4. ^ "로맨틱시티, 앨범 발매 전 전곡 프리뷰 공개" (in Korean). Hip-Hop Playa.
  5. ^ "Fresh 한 4인조, '후레쉬 보이즈(Fresh Boyz)' 인터뷰" (in Korean). Hip-Hop Playa.
  6. ^ "제이켠, [RE BIRTHDAY] 초도 물량 품절 및 메세지 공개" (in Korean). Hip-Hop Playa.
  7. ^ "제이켠, 3대 가수기획사 조롱곡 '파문'" (in Korean). Money Today.
  8. ^ "제이켠, 새 앨범 소식과 근황 전하다" (in Korean). Hip-Hop Playa.
  9. ^ "제이켠, 온라인 라디오 '나는 왕자다' 진행" (in Korean). Hip-Hop Playa.
  10. ^ "제이켠, 'Twinkle Soonkyu' P/V 공개" (in Korean). Hip-Hop Playa.
  11. ^ "2012년 16주차 Album Chart" (in Korean). Korea Music Content Industry Association.
  12. ^ "제이켠, 싱가포르 뮤직매터스서 힙합왕자 위용 떨쳐" (in Korean). E Today News.
  13. ^ "Rap Battles Begin Again – Mnet Announces Season 3 Of "Show Me The Money"". Kpop Starz.
  14. ^ "New Co-Ed Hip-Hop Group to Debut This Month, from Same Agency as Ailee and Wheesung". Soompi.
  15. ^ "Lucky J Has Decided To Go Separate Ways". Instagram.
  16. ^ a b "Gaon Album Chart". Archived from the original on March 26, 2015.
  17. ^ "Gaon Digital Chart". Archived from the original on March 9, 2017.
  18. ^ "2013년 29주차 Download Chart".
  19. ^ "2013년 41주차 Download Chart".
  20. ^ "'쇼미더머니5' 서출구-제이켠, 배틀 미션서 실수 남발 '실망'" (in Korean). Ten Asia.
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