The song "Crystal" is a track from the girls' 4th mini album 'Pink Blossom'. Although the girls are done promoting their title track "Mr. Chu", the girls released this surprise gift for their loving fans!

There's no word on if the girls will be using "Crystal" as their follow-up promotion track, or even when the full MV will be released. However, the girls are cute and adorable as always in the teaser, so check it out above!

The group also dropped a 'Typo Teaser' with lyrics from the song.