[2][3] Formed in May 2015, M.A.S 0094 was an independent group that performed and covered well-known songs in public with all profits going to charity for comfort women victims.

[10] On December 31, they were the only Korean act to participate and were the finale performance in the Hello Starlight Forest New Year's Eve Concert held at Changsha, China.

They later held a concert for the project's second season entitled We Will Debut Chapter 2 – Special Party in the same month.

[22] It made Tower Records Japan's "Top 10 Best-Selling Japanese Singles released by Korean Artists" for the first half of 2019.

[27] On October 13, they held a mini concert entitled Studio We: Live #3 "Fallin' Good Day".

On December 29, they held a Christmas mini concert entitled Studio We: Live #4 "My Own Band Room".

[32] "Parting" was then included as the lead single of the band's first demo album Studio We: Recording which was released on October 15.

From November 13 to 15, they held a mini concert entitled Studio We : Live #5 "A Moment in Full Bloom Under Two Starlights".

[34] Following the release of the album, the band held their Studio We : Live #5 encore concert online on December 13.

On June 16, Onewe released their first EP Planet Nine: Alter Ego, with their lead single "Rain To Be".

[38] The group released a pre-release digital single "Star" on November 23, in advance of their second demo album, Studio We: Recording #2, on December 7.

[43] Onewe participated in the reality television series Great Seoul Invasion which premiered on July 20 on Mnet.

Through the show, Onewe produced and released the song "Hippie (Freedom from MM)" as part of the EP Great Seoul Invasion Section 1.

[51] On November 15, Giuk made his solo comeback with his second EP Rise Waves and the lead single "Scratch".

[54] Onewe is the featured artist for "Memories" from Moonbyul's studio album Starlit of Muse which was released on February 20, 2024.

[60] On August 21, Onewe announced they would be releasing their digital single album Off Road on September 4, containing the three songs revealed through the concert.

New E!volution IV concert at Yes24 Live Hall in Seoul on November 30 and December 1, including new arrangements and unreleased songs fit for the year-end.

New E!volution IV, beginning in Vietnam on March 21, followed by 20 cities across the United States and Canada from April 6 to May 9, and a Seoul encore on June 14 and 15.