KNK (크나큰) is a five-member boy group under 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."
- Kim You Jin (김유진) - main vocalist
- Park Seung Jun (박승준) - main rapper, vocalist, visual
- Jeong In Seong (정인성) - main vocalist
- Kim Ji Hun (김지훈) - leader, vocalist, main dancer
- Oh Hee Jun (오희준) - rapper, vocalist, maknae
- "U / Back Again" (2017)
- My Keunakeun Television (Naver TV Cast, 2015–2017)
- My Keunakeun Television 2 (Naver TV Cast, 2017–present)
- 20th Century Boy and Girl (MBC, 2017) - as Boys Be Ambitious
- The literal translation of their group name KNK is "great" or "to be great".
- Their fan club name Tinkerbell was picked out by Park Seung Jun while the group were watching the movie 'Tinker Bell'. In his post in the fancafe he explained, "So KNK means to become “great” people and Tinkerbells are small cute fairies! So we are Peter Pan and Tinkerbells are fairies who protect us and we will protect Tinkerbells too!".