Astro (Hangul: 아스트로) (stylized as ASTRO) is a South Korean boy band formed by Fantagio in 2015. The group is composed of six members: Jinjin, MJ, Cha Eunwoo, Moonbin, Rocky, and Yoon Sanha.On August 14, Fantagio released information about the new group via their social media, including pictures and profiles of each member and the announcement of the group's name. Astro released their debut mini album Spring Up on February 23, 2016.Jeon was formed, the members started out as trainees under Fantagio iTeen, a rookie talent development program under Fantagio Entertainment. They were previously known as iTeen Boys.Through the same technique as how Fantagio formed 5urprise, Astro starred in a web drama series, titled To Be Continued on August 2015.
The members starred as themselves along with Kim Sae-ron, 5urprise member Seo Kang-joon and Hello Venus.On January 2016, Astro starred in their own reality show, Astro OK! Ready, which was aired on MBC Every1 at 7PM KST.
The group also made an appearance on KBS variety show, Golden Bell Challenge.