Kang Young Hyun, known professionally as Young K, is a South Korean musician, singer, songwriter and rapper. He is best known as the bassist, vocalist and rapper of South Korean rock band Day6.

He was raised in Ilsan, South Korea and moved to Toronto, Canada, to attend middle and high school at York Mills Collegiate Institute. Since sixth grade, he has not lived with his parents. During this time, he went by his English name, Brian Kang. Kang moved to Korea in 2010 and became a JYP trainee. On October 5, 2017, he received his bachelor's degree in Business Administration from Dongguk University.

During his time in high school, Kang Young Hyun pursued music in a three-member band called "3rd Degree". In 2010, he and his bandmate, Don Lee, were contacted by JYP Entertainment for an audition and was accepted as trainees. Lee later left JYP to pursue medical studies. Kang went on to appear in the fourth episode of WIN: Who is Next? as a part of JYP's rapping team with Got7's Mark Tuan and Jackson Wang against the combined rapping teams of Team A and Team B, where he became known for the verse, "YG, get an attitude!"

In 2014, Kang was selected as a member of five-member rock band 5Live under JYP, but their debut was cancelled. The band was reformed as Day6 after the addition of drummer Dowoon in 2015. On September 7, 2015, he made his debut as a member of DAY6 and released their debut EP, The Day, with the lead single "Congratulations". Young K has been credited with much of the songwriting in DAY6's discography. On 31 August, 2020, Young K, Dowoon and Wonpil debuted as Even of Day, a sub-unit of DAY6 and released their debut EP The Book of Us: Gluon, with the lead single „Where the Sea Sleeps".

Together with GOT7's Youngjae he became the new DJ of MBC Radio Idol Radio starting from May 18, 2020.