The zombie takeover in 4minute's new music video wasn't the only eerie happening on set as the girls also experienced a blackout while filming their "What's Your Name?" music video.

Cube Entertainment released behind-the-scenes footage showing all the lights of the MV set suddenly shutting down and 4minute getting excited because of this mysterious happening. For international fans who don't know already, there is a superstition in Korea that if an event like a blackout happens to you, it is a sign of good luck. The girls couldn't be happier after experiencing the blackout and yelled out, "daebak," with the sign that their comeback will be a hit.

The girls also shared that this is the first blackout they've had since their promotions for "Hot Issue" when they experienced the same thing in the studio. And true to the superstition, "Hot Issue" became an instant hit.

"What's Your Name?" has already swept music charts immediately upon release.

Check out the clip below!