1NB released a pre-debut track on February 6th, 2017 called "Stalker" (스토커). In April 2017, member Jung Yu (정유) who was part of the original line up left the group due to personal reasons. Soon after, Jayeon and Hajung joined the group. Before joining 1NB, Jayeon was part of Produce 101 under Happy Face Entertainment, which she got eliminated from on episode 5. In May 2017, Sojung joins the group. On June 4, 2017, member Jayeon releases a song with SoulstaR called " A Gloomy Spring" (우울한가 봄). Within August, members Hajung and Leeda were annouced to be joining The Uni+, however, both failed to become contestants.
On November 29th, 2017 they made their debut with "Where U At" (쉽지않아).
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