100% (Hangul: 백퍼센트) is a South Korean boy group that debuted in September 2012 under Andy Lee's company TOP Media with the single "We, 100%." Originally consisting of seven members, Sanghoon was announced to take time off from the group in 2014, while Changbum left in 2016. Leader Minwoo died in March 2018.

Pre-debut

In 2009, Rockhyun—under the stage name Rocky (Hangul: 로키)—was in Andy Lee's duo Jumper (Hangul: 점퍼) along with Park Dong-min that released two singles: "Yes!" featuring Eric of Shinhwa and "Dazzling" (Korean: 눈이 부셔) 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 (Hangul: 박동민). Minwoo had also been active as an actor. He starred in KBS2's 2006 drama Sharp 3 (Korean: 반올림3), SBS's 2007 drama The King and I and in two movies, Crazy Waiting (2007)[ and Where Are You Going? (Korean: 특별시 사람들) (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% (Korean: 틴탑의 뜬다 백퍼), in which they starred alongside fellow TOP Media artist Teen Top and its founder Andy Lee. Their debut single "We, 100%" was released on September 18. It consists of four tracks, including the instrumental version of "Bad Boy," which were all written and produced by Super Changddai. The same day, the music video for its lead track "Bad Boy" (Korean: 나쁜놈) went online on the band's official YouTube channel. 100% made their live debut of "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 (Korean: 틴탑&백퍼센트의 떴다 브라더스) premiered on MBC Music three days later, showing the two groups accomplishing missions. The group's first digital single "Guy Like Me" (Korean: 나 같은 놈), 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 (퍼펙션), 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 "Missing You" (퇴근길) and two others on November 20. They made their first live performance on Music Bank.

2014–2016: Minwoo's military service and lineup changes

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 "심장이 뛴다 (Beat)" on March 17, 2014. 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 "지독하게 (Better Day)" on October 13, 2016.

2017–present: Japanese debut, The Unit and Minwoo's death

100% debuted in Japan in January 2017 with the single "How to Cry." Shortly after finishing promotions in Japan, a surprise comeback in Korea was announced through the group's website. The group released their fourth mini album Sketchbook on February 22 with the title track "Sketch U." On June 22, 100% released their second Japanese single "Warrior" and its music video. On October 1, 2017 it was officially announced that all five members would be joining The Unit: Idol Rebooting Project.[citation needed] On October 11 it was reported that only two members passed and member Rockhyun was stated to be in the Center Group of the show.

100% released their third Japanese single "Song for You" on February 14, 2018, ten days after the music video was uploaded on YouTube. 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, 2018, it was announced that 100% would resume career and their mini tour announced before Minwoo's death.- Wikipedia