KNK is a South Korean boy group formed by YNB Entertainment, the company's first male idol group. KNK is an initialism which stands for K-pop knock, meaning "to knock on the door of K-pop with their music." They held their debut showcase on February 29, 2016 and officially released their debut single album titled Knock on March 3, 2016. The group currently consists of five members, Seoham, Inseong, Jihun, Heejun and Dongwon. Original member Youjin departed from the group on September 10, 2018.