Real name: 크나큰

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 K-pop with their music." They made their debut showcase on February 29, 2016 and officially released their debut single album entitled "Knock" on March 3, 2016.