Young K was born on December 19, 1993 in Ilsan, South Korea. He moved to Canada to attend high school, York Mills Collegiate Institute in Toronto, for 4 years. He used his English name, Brian Kang, while attending high school. He is currently studying Business Administration at Dongguk University in Seoul.
In 2014, Young K was chosen as a member of five-member rock band 5LIVE, but their debut was cancelled. The band was reformed as DAY6 after the addition of drummer Dowoon in 2015.
Young K officially debuted as a bassist and rapper of South Korean rock band DAY6 on September 7, 2015.