NASTY NASTY drop their 2nd MV teaser for 'Knock'.

Contrary to the 1st MV teaser, the new clip shows a more romantic setting where Kyugri and Kevin get into the bed with seet smiles on their faces. Moreover, we could also hear a snippet of their song.

Nasty Nasty (Nine Muses Kyungri, ZE:A's Kevin, and Sojin) are having their unit debut on September 3. Watch below: