[8][9] With Johan Kim's soulful vocal – often referred to as "R&B daddy," Jaeyoon Chong's song craftsmanship and producing ability, and Joon Lee's unique voice, rapping style and DJing skills, the trio have set themselves apart as pioneers in a country where the predominant soundtrack was residing in ballad and dance music.

[23][24] Chong established himself as a renowned music producer abroad – Taiwan, Hong Kong, Asian music scene and the U.S.[25][26] Lee became a successful business entrepreneur running a real estate development company with thirty or so employees in the U.S.[27][28] After a twenty-one-year hiatus, the trio reunited and released the fifth studio album, Into the Light (2018), on March 22, 2018.

[11] Joon Lee and Jaeyoon Chong were childhood friends growing up in Orange County, California, whose families attended the same church.

After struggling to even release their debut album, promotion or marketing was not an easy task for the young Korean Americans in a country where everything was foreign to them.

Because Chong wanted to give one last chance, he quickly began working on a new album, and the trio returned to the studio in California in September 1994.

[42] Chong added electric guitar sound to their single, "You are my first and last" (Korean: 넌 나의 처음이자 마지막이야) producing a bigger and stronger impact on their R&B sound and filled the album with various genres like the second album, including hip hop, rave, funk, ballad covering wide range of music in hopes to reach broader audience.

[44] Spring of 1996 in K-pop history was known as the Battle of Stars,[45][46] as series of heavy hitters were releasing albums, including Gun-Mo Kim and Seung-Hoon Shin, Solid was still topping charts with "You are my first and last" (Korean: 넌 나의 처음이자 마지막이야) and the subsequent single "Happy ending" selling over a million copies validating their status as a top selling artist with hit-making songcraft.

Because Chong and Kim were active members of Westcoast b-boying community before they became Solid, the trio was able to invite their close breakdancing friends and rappers from California to be part of the concert creating a party-like atmosphere.

[53] Attempting to differentiate their new album from the previous ones, they decided their single to be a dance number, "Birds of a feather flock together" (Korean: 끼리끼리).

[54] Keeping their R&B roots yet not losing their desire to expand their musicianship was imperative, which resulted in filling the album with more elaborate sounds and arrangements, some critics noted.

[56] In July, the trio began taking on an extensive break in the midst of much speculations to why the group was put to a halt at the height of their career.

[61] After twenty-one-year hiatus, Solid announced their long-awaited comeback on their official social media and billboards at subway stations in Seoul, Korea in early March.

[67][68][69] Tickets were sold out within five minutes on March 22, 2018, prompting the group to add an additional day to thank their fans who have been eagerly waiting for their comeback for over two decades.

[74][75] Critics and prominent musicians, like Chulsoo Bae and Jinmo Im, praise the new chapter of Solid for again presenting the kind of sound that no K-pop acts have ever taken part of – seemingly always ahead of their peers, which has always been the characteristics and the musical direction of the group.

[80][81] May 18 through 20th, 2018, Solid began the second concert tour of their career, Into the Light, in Seoul, Korea with packed audiences with a guest appearance from an acclaimed Canadian beatboxer, KRNFX.

[11][82][83] The setlist spanned from their '90s hits to the tracks from the latest album, which was highly praised for presenting the right balance between nostalgia and the next chapter of the group.