Individual members of ONEUS came out of various trainee programs. Today, ONEUS consists of five members: Seoho, Leedo, Keonhee, Hwanwoong and Xion. ONEUS has two meanings: One is that the members came together by gathering strength from every one of their fans. The other meaning symbolizes their mission to bring together regular people who will work side-by-side to create a united world. In Korean „ONEUS” also can be spelled as „One Earth”.

The group’s debut EP “Light Us “with „Valkyrie” serving as its lead single charted in the top ten of several countries’ iTunes charts, including at number one in the U.S. and Australia and at number fifteen on Billboard’s World Digital Song Sales chart. They also had their first Japanese comeback with the single „808” debuted at number 1 on the Oricon Daily Single Chart with 3,662 copies sold on the first day of release. Their most recent release was on September 26, 2023 with their tenth mini album “La Dolce Vita”.