ONEUS (원어스) debuted on January 9, 2019 under RBW Entertainment. They were previously known as 'RBW Boyz' and have multiple seasons of pre-debut reality show content that they did with their brother group ONEWE (previously known as MAS). Together, ONEWE and ONEUS released the song, Last Song, prior to debut.

Ever since debut, ONEUS members partake in their music production and help with writing lyrics. They also create their choreography themselves. Because of their passion for their work, their number of supporters kept on growing through the years and even successfully finished 2 concert tours in Korea, Japan and US. On November 17, 2021, they finally got their first music show win with their title track, LUNA from the BLOOD MOON album.

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