KNK (크나큰) is a five-member boy group formed by YNB Entertainment. They debuted on March 3, 2016 with the single "Knock". Their name stands for K-pop kNocK which means "to knock on the door of K-pop with their music."
On September 10, 2018, KNK announced they have left YNB with Youjin leaving the group as well. On December 20, KNK introduced their newest member, Lee Dong Won. Starting January 2, 2019, they are under 220 Entertainment.