Lucy is less than a day away from their latest comeback!

On February 15 KST, the Mystic Story band unveiled the music video teaser for their new single "Hero," the title track off of their 3rd single album 'INSIDE.' In the teaser, the four members are seen in something of a futuristic mission control room, admiring the technology in front of them. Other shots reveal that they are traveling in a spaceship, adding a sci-fi element to the song's 'hero' concept.

Meanwhile, 'INSIDE' is set for release on February 16.

Check out the teaser above!