In addition to his solo career, Kim has also sung the OSTs of award-winning popular dramas and performed in musicals.

Despite not having a musical background, Kim dreamed of becoming a singer as a teenager, especially after watching HOT, and sent in a demo tape to Park Jin-young, who was recruiting a final member for the project group that would become g.o.d.

[1][2] He bought a one-way ticket to Seoul after being called in for an audition and eventually signed with Park's company JYP Entertainment.

Despite a lukewarm response to their debut performance in January 1999, g.o.d went on to establish themselves as one of the most popular first-generation K-pop groups.

[8] After his discharge, Kim returned to the entertainment industry, joining the KBS Variety Show, Invincible Youth as a permanent cast member.

In February 2010, Kim and toured overseas together for the first time with his g.o.d bandmate and close friend Son Ho-young.

Chapter 8 was released on July 8, 2014 and was co-produced by Kim and renowned songwriting duo Duble Sidekick.

[20] They will concentrate mainly on releasing new material and holding live concerts rather than promoting or performing on music programs as a group.

[21] Released on June 18, the album contained two lead singles, one of which was "Lonely Funk", which featured hip hop artist and former 2PM member Jay Park.

[29][30] He was one of fifteen artists or groups, including the likes of Insooni, 2PM and DJ Doc, headlining the medal ceremony aftershow for each day of the 2018 Winter Olympics in Pyeongchang County.

[35] As HoooW, they have appeared on Immortal Songs: Singing the Legend and You Hee-yeol's Sketchbook and performed as guests at Psy's summer concerts.

On August 16, they released the digital single "Game Over" (Korean: 친구는 이제 끝내기로 해; RR: Chinguneun ije kkeutnaegiro hae).