What makes Everyday 2 by Girl's Day notable?

'Everyday 2' features the hit single 'Oh! My God', which contributed to their rise in popularity and helped them gain recognition within the K-pop industry. The album showcased a fresh sound that resonated with fans and critics alike, contributing to Girl's Day's evolving identity as a prominent girl group. Released on January 1, 2012, 'Everyday 2' was Girl's Day's second mini-album following their debut with 'Girl's Day Party.' At this point in their career, they were establishing themselves in the competitive K-pop scene, building on the initial buzz from their early singles and performances.