Planet Nine: Alter Ego

Planet Nine: Alter Ego is the first extended play by the South Korean band Onewe. The album was released by RBW on June 16, 2021, and distributed by Kakao Entertainment. It consists of seven songs, including the lead single "Rain To Be".

Background and release
On January 22, 2021, a special teaser was released for Onewe's Studio We : Live #6 "Onewe? or Onewe!" online concert revealing the band's new unreleased song "Aurora". The song was unveiled through a live performance at the concert on January 23 and 24.

On May 31, RBW posted a teaser announcing Onewe's first EP Planet Nine: Alter Ego which would be released on June 16 at 6pm KST.

On June 3, the full track list was revealed with a total of seven songs, self-written and composed by the band with all five members participating in the song production, including the lead single "Rain to Be" and the official release of "Aurora".

On June 16, the EP was released along with a music video for "Rain to Be", following which music videos for the songs "Veronica" and "Aurora" from the EP were also subsequently released on June 28 and July 2 respectively.