Iz*One debuted on October 29, 2018 with their first extended play Color*Iz. Upon its release, the group received immediate commercial success, selling over 225,000 units and peaking at number 2 on South Korea's Gaon Album Chart. In addition, both the EP and its lead single "La Vie en Rose" charted on Billboard World Albums and World Digital Songs respectively. The early success subsequently hailed them as the New Artist of the Year at several awards ceremonies, including Golden Disc Awards and Seoul Music Awards.
The group's Japanese debut single, "Suki to Iwasetai", was released on February 6, 2019 under UMG's EMI Records label. Peaking at number 2 on Oricon Singles Chart and with over 250,000 unit sales, the single was certified Platinum by the Recording Industry Association of Japan.