“So Hot” was initially released on May 22, 2008 for digital download. Afterwards, the maxi-single titled So Hot – The 3rd Project was released on June 3, 2008.

The Wonder Girls began their comeback performances on May 31, 2008 on MBC’s Music Core, performing “So Hot” and “This Time”. The members sported a brand new mature look, wearing leopard print outfits.

A music video was produced for the song, showing the girls in various situations, with men instantly falling in love with them. “So Hot” became an instant hit and was the number one hit on various online and offline charts.