"RBW Brother Group" ONEUS and ONEWE will release winter season songs.

The agency RBW said, "The artists ONEUS (Ravn, Seo-ho, Leedo, Keonhee, Hwanwoong, and Xion) and ONEWE (Yonghoon, Harin, Kanghyun, Dongmyeong, and CyA) will release their digital single 'STAY' on December 21st."

As a result, ONEUS and ONEWE will work together as a joint single for the first time in three years and three months since the title song "LAST SONG" was released in September 2018.

The two groups are expected to achieve the best synergy as they have boasted strong friendship by appearing as guests in each other's solo concerts since they were trainees.