What makes Diva by After School notable?

'Diva' was well-received, reaching number 29 on the Gaon Digital Chart and contributing to After School's rise in the competitive K-pop market. Its success helped pave the way for future hits and solidified their standing as a prominent act within the genre. Released on April 9, 2009, 'Diva' marked After School's debut single, launching their career in the K-pop scene. This track established them as a notable girl group following their formation in 2008, setting the stage for their subsequent releases and growing popularity.