Young K

Kang has been credited with much of the songwriting in Day6's discography. In 2019, he composed and contributed lyrics to a track for the solo debut of B.A.P's Youngjae entitled "Hope". He has also been featured as rapper in various JYP label mates' singles, such as Baek A-yeon and Park Ji-min.

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.

In 2010, Kang 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!" He was also a part of JYP's vocalist team alongside his eventual Day6 bandmates Junhyeok, Jae, Sungjin and Wonpil.

Kang Young-hyun (born December 19, 1993), 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.

Kang was born on December 19, 1993, in South Korea. He moved to Toronto, Canada, to attend middle and high school at York Mills Collegiate Institute. He went by his English name, Brian Kang, during that time. On October 5, 2017, he received his bachelor's degree in Business Administration from Dongguk University. He graduated from University on August 23, 2018.