SEE ALSO: Eunkwang drops track list of his solo single for 'Piece of BTOB'

The teaser video shows a story of a couple who are going through a rough time together. Even though Eunkwang himself is not in the video, the much-talented model/actress Kim Jin Kyung is in the music video. With her great acting skills and Eunkwang's amazing voice, the MV will surely be something to look forward to. Check out the teaser clip above.

Stay tuned for the full release of "One Day" on September 19, 6 PM KST.