"Knock" is the debut single album by KNK. It was released on March 3, 2016 with the title track used to promote the single.
- "Knock" - 3:42
- "Angel Heart (마음씨)" - 3:37
- "Knock" (Inst.) - 3:42
- "Angel Heart (마음씨)" (Inst.) - 3:37
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