What makes Ace of Angels by AOA notable?

The album was significant for its commercial performance, peaking at number 2 on the Gaon Album Chart and showcasing AOA's growing popularity in Japan. It also featured multiple tracks that resonated with fans, leading to chart successes and solidifying their status as a leading girl group in the K-pop industry during this era. Released on January 1, 2015, 'Ace of Angels' marked AOA's first full-length album as they were transitioning from a successful EP format to a more expansive project. At this point in their career, AOA was solidifying their presence in the K-pop scene after notable hits like 'Miniskirt' and 'Like a Cat'. The album showcased their versatility and ability to appeal to both Korean and Japanese markets.