) is a South Korean singer-songwriter, dancer, and stage actor.
In 2009, Kim and fellow TVXQ members Kim Jaejoong and Park Yoochun filed a lawsuit against SM Entertainment, arguing that their exclusive contracts were unilaterally disadvantageous towards the artists and should be invalidated.
The Seoul Central District Court ruled in favor of the three and granted an injunction suspending their contracts. After the release of Xiah, Kim's solo music career was sent into hiatus because of a discord between him and his Japanese label Avex Trax that led to the sudden suspension of all his activities in Japan.
In May 2012, he released his first full-length Korean solo studio album Tarantallegra, while being represented by new management agency C-Je S Entertainment.
Following the release, he embarked on his first headlining world tour.
Despite limitations in media coverage and promotional activities caused by a ban in the Entertainment Departments of South Korea's three main terrestrial broadcasters resulting from SM Entertainment's interference, Kim's first and second studio album reached top two on the Gaon albums chart in South Korea, as well as reaching number-ten and number-five on the Billboard World Albums chart for Tarantallegra and Incredible, respectively.
He is also known for being able to sell out tickets for his concerts and musicals within minutes, dubbed "the ticket power" by South Korean media.
Kim was born and raised in Gyeonggi-do, South Korea.
He has an older fraternal twin brother named Kim Junho, who is also a singer mainly active in Japan and China where he is more well known by his stage names JUNO and ZUNO.
At age eleven, Kim was signed by SM Entertainment after his participation in the agency's the 6th Annual Starlight Casting System.
In 2002, SM Entertainment placed Junsu in a project R&B group with another trainees Eunhyuk and Sungmin.
They appeared on a show called "2002 Survival Audition - Heejun vs.