Unicorn was first revealed to the public in August 2015 through Naver TV Cast's web miniseries I Am a Girl Group, a five-episode sitcom that “revolves around various topics concerning K-pop idols, such as dating and dieting.”
Unicorn pertama kali diperkenalkan ke publik pada Agustus 2015 melalui serial web mini oleh Naver TV Cast berjudul I Am a Girl Group, sitkom lima episode yang “mengelilingi berbagai topik tentang idola K-pop, seperti kencan dan diet.”