ASTRO ( Spain : the Astro , Korea : 아스트로 ) as the boy band Korean citizenship under Fantagio consists of 6 people, including MJ, Jin Jin, Cha Eun Woo, Moo Bin, Rocky and Yoon San ha. On August 14, 2015, Fantagio has released personal pictures and profiles of each member of the group as well as announcing the group's official name.

the day. February 22, 2016, they released the music video Hide & Seek. 

February 23, 2016, it was officially released with the first work in a mini-album called Spring Up .

​