There are several artists using this name:
1) 100% (Hangul: 백퍼센트) is a 7-member South Korean boy group that debuted in September 2012 under Andy Lee's company T.O.P Media with their first single album We, 100%. They made a comeback on the 7th of December with digital single, Guy Like Me.
100% consists of members: Seo Minwoo, Kim Rokhyun, Jo Jonghwan, Kim Chanyong, Woo Changbum, Jang Hyukjin, and Lee Sanghoon.

Read more about 100% on Last.fm.