KNK (Hangul: 크나큰; RR: Keunakeun, lit. "great" or "to be great") is a five-member South Korean boy band under YNB Entertainment, the company's first male idol group. KNK is an initialism which stands for K-pop kNocK (Hangul: 케이팝 노크). It means "to knock on the door of the K-pop industry with their music." They made their debut showcase on February 29, 2016 and released their official debut single album entitled KNOCK on March 3, 2016.