Pre-debut In 2009, Rockhyun—under the stage name Rocky ()—was in
Andy Lee's duo
Jumper () along with Park Dong-min that released two singles: "Yes!" featuring
Eric of
Shinhwa and "Dazzling" () featuring
Kang Ji-young. The same year,
Minwoo was featured during Andy Lee's promotion for his song "Single Man," along with Park Dong-min (). Minwoo had also been active as an actor. He starred in
KBS2's 2006 drama
Sharp 3 (),
SBS's 2007 drama
The King and I and in two movies,
Crazy Waiting (2007) and
Where Are You Going? () (2009).
2012–2013: Debut and sub-unit Between June and September 2012, 100% were featured in
SBS MTV's variety show
Teen Top Rising 100% (), in which they starred alongside fellow TOP Media artist
Teen Top and its founder Andy Lee. Their debut single album "We,100%" was released on September 18. It consists of four tracks, including the instrumental version of "나쁜놈 (Bad Boy)", which were all written and produced by Super Changddai. The same day, the music video for its lead track "나쁜놈 (Bad Boy)" went online on the band's official YouTube channel. 100% made their live debut of "나쁜 놈 (Bad Boy)" on September 21 on
KBS Music Bank, followed by
MBC Music Core and
SBS Inkigayo that same weekend. On October 23,
MBC held a press conference for 100% and
Teen Top's second variety program in
Jangan-dong,
Seoul.
Teen Top & 100% Rising Brothers () premiered on
MBC Music three days later, showing the two groups accomplishing missions. The group's first digital single "나 같은 놈 (Guy like me)", written by Minigun and Super Changddai, was released on December 7 along with its music video. 100% released their first extended play
Real 100% and a music video for "Want U Back" on May 23, 2013. On July 17, the group's official fanclub, Perfection (), was announced by TOP Media. 100% V, a sub-unit consisting of Rockhyun, Jonghwan, and Hyukjin along with rapper Chanyong, was announced by TOP Media on November 14. The sub-unit released a single consisting of lead track "퇴근길 (Missing you)" and two others on November 20. They made their first live performance on
Music Bank.
2014–2016: Minwoo's military service and members departure In February 2014, TOP Media announced on both 100%'s official website and fancafe that leader Minwoo had to
enlist in the
Korean military starting on March 4. In March, the agency announced that Sanghoon will take some personal time off until he finalizes on what to do in the future. With five members remaining, 100% released their second extended play
Bang the Bush and music video for "Beat" () on March 17. On July 7, the five members released their second single album, "100% Cool Summer Album 'SUNKISS'" with the title track being, "니가 예쁘다 (U beauty)", and it debuted three times on the Gaon chart in the following weeks of July after its release that same year. On September 12, 2016, TOP Media made an official announcement that Changbum had left the group. The remaining members would continue as five and prepare for a comeback in October. 100% released their third extended play
Time Leap and a music video for "Better Day" () on October 13.
2017–2019: Japanese debut, The Unit, Minwoo's death, Sunshine, RE:tro, and military service 100% making their Japanese debut with released single "How to Cry" in January 2017. The group later released their fourth mini album
Sketchbook on February 22, with the title track, "Sketch U" (). On June 28, 100% released their second Japanese single "Warrior". In October, it was confirmed all members of 100% would be competed in
The Unit. Member Rockhyun and Hyukjin passed the audition. Hyukjin was eliminated in 34th place due the second elimination round while Rockhyun did not enter on TOP9 and only finished in 14th place due the final round. 100% released their third Japanese single "Song for You" on February 14, 2018 On March 25, 2018, it was reported that Minwoo had died from cardiac arrest at his home at the age of 33. On April 2, it was announced that 100% would resume career and their mini tour announced before Minwoo's death. 100% released their fourth Japanese single "Summer Night" on June 27. On July 26, 100% made their first Korean comeback in over a year and a half with the digital single "Grand Bleu", then they announced the fifth mini album release,
Sunshine, with title track named "맘 (Heart)". 100% carried on with their Japanese promotion and released their fifth Japanese single "28°C". After that, they held "Walking On The Clouds" concerts from January 25 to 27, 2019. On March 14, 100% released their fifth mini album
RE:tro, with the title track "Still Loving You", and promoted their comeback in Korea. On June 25, it was announced that all four members would be enlisting during the latter half of the year. Rockhyun and Chanyong enlisted on July 15, Jonghwan on July 22, and Hyukjin on August 26.
2021: Disbandment On September 23, 2021, TOP Media announced that 100% would disband after the expiration of their contracts on October 9. On September 27, before their disbandment, they released their last single, "Can't say goodbye" (). ==Members==