On October 7, 2015, JYP Entertainment launched the band's official website and announced via SNS that the group would debut with the mini-album The Story Begins and title-track "Like OOH-AHH". The track is described as a 'color pop' dance track with elements of hip-hop, rock, and R&B. The composition team included Black Eyed Pilseung, known for composing successful releases such as Miss A's "Only You." On October 20, the album and the song's music video were released online and through the Naver V App.[18] The group held a live showcase the same day, where they performed "Like OOH-AHH" along with dance tracks "Must Be Crazy" and "Do It Again." The music video reached almost 1 million views in less than 12 hours.