Kim Jong Kook first entered the Korean music industry in 1995 as a member of the group Turbo, which became fairly popular for their catchy music. After the group disbanded a few years later, he became a solo singer in 2001, mostly concentrating on ballads. Although his unusually high tone of his voice is often criticized and joked about with many stars jokingly calling it a "mosquito voice", he has had many hit singles and has also been a frequent guest on many variety shows, most notably X-Man. In addition, his body is often considered one of the best in K-Pop, due to all his muscle training.
By 2005, Kim Jong Kook became one of Korea's most popular artists; his third album sold in excess of 300,000 copies, making it one of the year's best-selling albums in Korea. He capped off that year by sweeping the 3 Daesang from all 3 major TV stations. In doing so, he became only the second artist ever to accomplish this feat since Jo Yong Phil in the 1980s. The lead single from the album, "Lovely", topped many charts. It was also included in Pump It Up and Audition Online.
On January 21, 2006, Kim Jong Kook, Jeon Hye Bin, and Im Tae Kyung participated in Thuy Nga's Paris by Night 81 Vietnamese concert in California. Kim Jong Kook performed "To Her Man".
In March 2006 Kim Jong Kook received his military service enlistment letter at the height of his popularity and career. Kim also released his fourth album around this time, unable to directly promote it while in the military, he used unorthodox methods. To comply with Korean law, the music video was shot so that his face would never be seen on screen. Also, in order to raise awareness, Kim Jong Kook's rumored girlfriend Yoon Eun Hye was asked to star in the music video. Though there has been no direct promotion, his fourth album has sold in excess of 100,000 copies.
It was announced in late April 2008 that the singer would end his military service on May 23, 2008. On that day, he was greeted by fans, and during his interview, he said that he was "relieved". His fifth studio album was released on October 22, 2008 as "Here I am" with the featuring song as "Today More than Yesterday" and "Thank you." Proving the "tradition" of not being able to rise once again after military service false, Kim Jong Kook made a successful comeback, making one album, one digital single Happy Virus and one trot Ddajo.
Kim also returned to television, becoming a permanent member of variety show Family Outing, part of SBS's Good Sunday lineup and earning popularity, especially with the love scandals between Lee Hyori and Park Ye Jin. Kim Jong Kook's Hoolala CF with Kim Sooro was released on July 2009. He has also posed for many advertisement for clothing. His sixth album was released on January 27, and a preview of the album was released with the song "Don't Be Good to Me." However the title song for the album is titled "This is the Person". The music video for the song included Park Ye Jin who is famous for the "Family Outing Scandal" between Kim Jong Kook, Lee Hyori and Park Ye Jin. His sixth album is titled "The Eleventh Story" because in his music career, he has so far released 11 albums. It included 3 MV. Right now, he is a regular on SBS's Running Man.
On August 27, 2010 Kim Jong Kook received a lumbar microdiscectomy back disk surgery at Seoul’s Kwan Ahk Goo Chung Ryong Dong Kangnam Choice hospital. Kim Jong Kook’s management company, 101 Entertainment, stated, “Kim Jong Kook carried on with his daily activities without knowing that he had a ruptured disk. He did feel pain, but didn’t think much of it, and he endured his condition with painkillers while filming SBS Running Man
Source: http://www.museumstuff.com/learn/topics/Kim_Jong_Kook::sub::Biography