The member of the group's highlight Son Dong woon, released his first mini album.

Son Dong woon posted the schedule plan through his agency Around Us, along with a preview of the release of his first mini album, "Act 1: The Orchestra."

According to the unveiled schedule plan, the company unveiled concept photos, track lists, highlight medley and music video teaser starting with the album preview and noon at midnight on April 15, heating up the pre-release atmosphere.

Son Dong woon is set to join the military as a mandatory police force on May 9, successfully finished his solo concert "The Orchestra" at Yes 24 Live Hall for two days on April 27 and 28 at the same time as the album's release on April 22.

Son Dong woon's first mini album, "Act 1 : The Orchestra," is released on various music sites at 6 p.m. on April 22.