In 2013, they released two more single albums, Moya (as a sub-unit AOA Black) and Red Motion, in July and October respectively.

The third EP, Heart Attack (2015), becomes the group's best-selling album in Korean with total sales of more than 47,000 physical copies.

AOA's fourth EP titled Good Luck, which was released in May 2016, sold more than 40,000 physical copies as of December 2016.

AOA then released their debut Japanese studio album titled Ace of Angels one year later in October 2015.

Their fourth and first original Japanese single, "Give Me the Love," featuring vocals of Takanori Nishikawa was released in April 2016.