Bolbbalgan4 (BOL4) is less than a day away from a comeback!

On October 25 KST, Shofar Music unveiled a music video teaser for "Butterfly Effect," the title track off of Bolbbalgan4's upcoming single album of the same name. In the clip, Ahn Ji Young is seen spending time alone, gazing forlornly out the window on a rainy day and looking rather introspective as a portion of the song is heard in the background.

Meanwhile, 'Butterfly Effect' is set for release on October 26.

Check out the music video teaser above!