(Photo : Fantagio)

Astro is a South Korean boy band formed by Fantagio that debuted in 2016. The group is composed of six members: Cha Eun-woo, MJ, JinJin, Moonbin, Rocky and Yoon Sanha. They debuted with the single "Hide & Seek" from their debut EP Spring Up, and were subsequently named by Billboard as one of the best new K-pop groups of 2016.

On March 13, 2020, Astro released special single album One&Only for their 4th anniversary debut.

On May 4, 2020, Astro released their seventh extended play Gateway, promoting the song "Knock." On May 13, 2020, They received an award from the Korean music show, "Show Champion" for the song "Knock," marking the group's second win. On June 28, 2020, Astro held an online "Ontact" concert '2020 ASTRO Live on WWW.' to communicate with fans in a new way. On June 28, 2020, Astro released the digital single "No, I Don't," and they performed it for the 1st time at the "2020 ASTRO Live on WWW."

On August 14, 2020, Fantagio confirmed that Moonbin and Yoon San-ha would form Astro's first sub-unit, and recording for the unit's first album has already been completed. The release date of the album is on September 14, 2020.

On August 21st, 2020, the first teaser for the subunit was released. On August 24, 2020, the title of the new mini-album was released along with another teaser. The title of the upcoming album of the subunit was released to be "IN-OUT." The tracklist, released a few days later, revealed that the album would have five songs in total, and the title track would be called "Bad Idea." On August 31st, FADE OUT version teaser images were released, followed by a FADE IN version on September 1st.

As of 7th August 2020, a highlight medley has been released for the new subunit mini-album. You can watch it here now:
We wish Moonbin and Sanha all the success on their debut album!