0+1=1 (I Promise You) is the second extended play by South Korean boy group Wanna One, a project group created through the 2017 Mnet survival show, Produce 101 Season 2, composed of eleven trainees from different entertainment companies that will promote for 18 months under YMC Entertainment. The album was released digitally and physically on March 19, 2018 by YMC Entertainment, Stone Music Entertainment and CJ E&M Music