유재석
In the summer of 2020, through "Hangout with Yoo", Rain, under the stage name B.Ryong, collaborated with Yoo Jae-suk and Lee Hyori to form a summer project co-ed trio SSAK3. The group's song "Beach Again", released on July 18, 2020, topped various music charts upon release and topped the Gaon Digital Chart for five consecutive weeks. SSAK3 also released "Play That Summer" as well as solo songs, including Rain's "Exciting" featuring Mamamoo, on July 25 as part of the group's project.