Group 4minute revealed a happening from filming for their new song "What's Your Name?" music video.

Their agency Cube entertainment revealed the 'sign of epic success' video today that revealed what happened while filming for their music video.

In the video clip, 4minute is yelling after there was a blackout.

Huh Gayoon said, "There was a blackout for 'Hot Issue' too. This means our song is going to make a huge hit."

4minute turned into hip hop girls through their new song "What's Your Name?."

Photo Credit: Cube Entertainment