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- Name: Kim Hyun-Joong / Kim Hyeon-Jung
- Hangul: 김현중
- Birthdate: June 6, 1986
- Birthplace: Seoul, South Korea
- Height: 182cm
- Blood Type: B
- Talent Agency: KeyEast
Kim Hyun-Joong was born on July 6, 1986 in Seoul, South Korea. His family consists of his parents and one older brother. Kim Hyun-Joong was a diligent student in elementary school & received high scores. Things changed for Kim Hyun-Joong by his middle school days. He started working part-time since the 2nd year of middle school and, because of this, his school grades suffered. Remarkably, Kim Hyun-Joong was able to save nearly 100,000,000 won (roughly $87,000 USD) from his part-time jobs by his year school years.
During Kim Hyun-Joong's late teen years, he felt the subjects he was learning in high school were useless for his life and, consequently, decided to drop out of high school. Often, during this time, he wound up at the police station for fighting.
By the age of 18, Kim Hyun-Joong performed in a youth band named "Aksuseu" ("악서스"), which was formed with Kim Hyun-Joong's Catholic Church friends. They were quite popular in his local neighborhood of Songpa-gu in Seoul.
While working part-time jobs, Kim Hyun-Joong was cast by the boss of an entertainment company, but the boss turned out to be a con man. After getting away from that management company Kim Hyun-Joong was introduced DSP Entertainment and, after auditions, became a member of boy band SS501. SS501 released their self-titled debut album "SS501" on June 23, 2005. Since then Kim Hyun-Joong has performed as a singer until being cast in the KBS2 drama "Boys Over Flowers". Kim Hyun-Joong was the first member of the F4 group in "Boys Over Flowers" to have been cast. The other three members of the F4 were then cast with Lee Min-Ho, Kim Beom, Kim Jun playing their respective characters. Kim Hyun-Joong was at first reluctant to take on the role of Yoon Ji-Hoo due to fear of ruining his musical career. Nevertheless, Kim Hyun-Joong agreed to play the role and then performed due diligence on his character. Kim Hyun-Joong went out and bought all 37 episodes of the original manga "Hana yori Dango".
During filming of "Boys Over Flowers" Kim Hyun-Joong became close to actress Lim Ye-Jin & Lim Ye-Jin often advised Kim Hyun-Joong on his acting. Kim Hyun-Joong stated in press conference for "Boys Over Flowers" that he learned to be more patient and calm through his acting experience. 
Later in 2009, after Kim Hyun-Joong attended a promotional event for "Boys Over Flowers" in Japan, Kim Hyun-Joong was diagnosed with Influenza A (H1N1) virus on Tuesday Sept. 8, 2009. Kim Hyun-Joong was then quarantined at a hospital in Japan. After making a complete recovery, Kim Hyun-Joong was finally able to return to South Koorea one week later. 
After "Boys Over Flowers," Kim Hyun-Joong left DSP Entertainment and joined KeyEast management company, which actor Bae Yong-Jun is the largest shareholder. In 2010, Kim Hyun-Joong was cast for the MBC drama "Mischievous Kiss". In the drama series, Mischievous Kiss Kim Hyun-Joong a genious high school/college student named Baek Seung-Jo. In a promotional interview, Kim Hyun-Joong stated that to improve his pronunciation (he felt he mumbled sometimes), he held a wine cork in his mouth while practicing his lines. 
While appearing on the talk show "Kang Shim Jang" (hosted by Lee Seung-Ki & Kang Ho-Dong), Kim Hyun-Joong mentioned that he dated a member of female idol group for 5 months, but didn't specify her name. He did mention that they went to the movies together and once went on a fishing trip. 
- According to Kim Hyun-Joong's management company, KeyEast, on February 6, 2013 lead actor Kim Hyun-Joong has quit the drama series "City Conquest". He will now focus on touring for his music career in Japan and worldwide and in the 2nd half of 2013 will concentrate on a new drama series.
- Dream High | Deurim Hai (KBS2 / 2011) - cameo
- Mischievous Kiss | Jangnanseureon Kiseu (MBC / 2010) - Baek Seung-Jo
- Boys Over Flowers | Kkotboda Namja (KBS2/ 2009) - Yun Ji-Hu
- Can Love Be Refilled? Sitcom (KBS2 / 2005)
- Nonstop 5 (MBC, 2005, ep 208)
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- "김현중, 학창시절 1억원 모은 사연 공개", "Star News." "January 22, 2009"
- "김현중, “학창시절 경찰서 많이 다녀, 지금은 맞는 게 이익”", "MaxMovie," "December 17, 2009".
- "김현중, 청소년 밴드 '악서스' 모습 최초 공개 '풋풋'", "SPN edaily," "October 28, 2009".
- "김현중 “‘꽃남’ 원작만화 37권 독파하며 캐릭터 연구했다”", "Newsen," "March 5, 2009".
- "꽃보다 김현중 “지금은 숙성중입니다” (인터뷰)", "ETO," "January 23, 2009".
- "김현중 신종플루 치료 일주일 만에 퇴원", "News Way," "September 15, 2009".
- "김현중과 나누는 '장키' 인터뷰", "iMBC," "August 23, 2010".
- "김현중 “여자 아이돌 가수와 5개월 연애했다”", "Sports Khan," "December 16, 2009".