Often seen simply as Gyujin, he gained fame as one of the lead vocalists for the band UP10TION. The South Korean pop group has released several successful EPs since their debut, including 2017's #1 EP Star:dom.
He debuted as the eighth member of UP10TION on the television series Masked Rookie King in 2015.
The 2017 UP10TION single "ID" sold gold in Japan after its release.
He and his two younger brothers hail from Incheon, South Korea.