Girls' Day released their pictorial, new song "I Miss You", music video, and greetings to their fans on October 15.

Their song, "I Miss You" was a surprise comeback and the first time Girls' Day attempted a ballad as their title song.

On October 14, Girls' Day revealed the teaser pictures for their new song, "I Miss You."

On Girls' Day's official Twitter, four pictures of each member crying were posted.

Sojin, Yura, Minah, and Hyeri were crying with expressions as if they had a story behind each tear drop.