SISTAR's member Soyou showed support for her agency's junior group Boyfriend.

On October 10, Soyou posted on her Twitter, "Let's go. Fighting Boyfriend" along with a picture of members Donghyun and Sunghyun.

Boyfriend had made their comeback on October 9 through "M! Countdown".

Boyfriend's agency Starship Entertainment said, "Boyfriend members will turn into fantasy 'wolf boys' through their title song 'WHITCH', revealing their sexy charm."