Wanna One will release a new digital single, "B-Side," and release a music video through an online music site before 6 p.m. on January 27th.

Before its release, a group image was released on Wanna One's official SNS channel on the 27th, adding to expectations for an official song. The photos show Wanna One and fans reunited for the first time in three years through the 2021 MAMA (Mnet Asian Music Awards), creating a touching feeling.

The new single 'B-Side' replays the time between Wanna One and Wannables, which had been stopped on 'A-Side,' with 'B-Side,' and at the same time as always, 'Beside' It is an album that contains the meaning of always stays next to them as always.