Beginning his career debut Kim Hyun Joong from SS501 to Boys Before Flowers

Kim Hyun Joong SS501 debut as leader in 2005. Then on May 11, 2008 he joined the reality show television channel MBC is the "We Got Married". in the reality show he acted as the husband of Hwang Bo, a senior singer whose age was six years older than him. they both dijuliki "mustard Couple" and managed to win the award "Best Couple" award in the MBC. Eventually the couple's exit from the event on December 14, 2008.

Thanks to appear on the reality show is Kim Hyun Joong get an offer to play in the drama "Boys Before Flowers" as Yoon Ji Hoo, a member of F4. Drama has reached high ratings and successful not only in Korea but throughout Asia.
In Septemper 2009, in the midst of promotional activity "BBF", Kim Hyun Joong in diaknosa exposed to H1N1 (Swine Flu). pengakit are making it unable to attend the "Seoul's International Drama" award. But on September 15, 2009 ago, he has been cured and discharged from the hospital.

In addition Hyun Joong also become a participant in the reality show "Haptic Mission", event organized by Samsung to select the best workers. He played with Lee Min Ho, Kim Joon and Son Dam BI. After usainya event he starred in a variety of advertising "Samsung Haptic".