Boy bang B1A4's Sandeul became a pizza delivery boy in the teaser image revealed.

On July 3, B1A4 posted a teaser image of Sandeul delivering pizza through the group's official homepage.

The picture reveals no clue about the music video's plot or album theme, and fans have been coming up with different speculations on the song's direction.

Jinyoung's teaser was revealed yesterday on July 2, and fans have been trying to connect the dots between the two completely different teasers.

WM Entertainment stated: "The music video of SOLO DAY, filmed in the United States, will be a very refreshing and entertaining MV for fans."