[4][5] With the show wrapping up in August 2018, the group's label, Off the Record, announced that Iz*One will make their official debut later that year in October.

[6] Iz*One immediately started preparations for their debut after the show's finale and the members were put on a tight schedule as they recorded their debut album and filmed for various shows and their title track's music video, making it difficult for member Chaewon who also had to prepare for the College Scholastic Ability Test in South Korea.

[9] On November 4, 2018, Iz*One released a choreography video of "La Vie en Rose" on YouTube[10] The lead single "La Vie en Rose" is described by Billboard as a vibrant, groovy electropop track that blends a wide range of elements like ambient synths, stomping beats, tinny snare and echoing strings.

[20] The official music video for "La Vie en Rose" is inspired by the color red, as the title is French for "The Life in Pink" , with the twelve members seen singing and dancing in red-and-leather outfits.

[23] Tamar Herman of Billboard opined that the lead single is "Captivating from the get-go" and that the group served up an introductory track that is "all at once powerful and delicate".

She further added that "Rather than coming off as contradictory, the duality featured in Iz*One's debut song and video hints to the act's potential amid one of the most experimental pop music scenes in the world and highlights why these 12 were handpicked from among the nearly 100 women who competed for a spot in the group on this year's Produce 48".

[11] South Korea's Hanteo Chart reported that Color*Iz broke the record for highest first week sales of a debut album for girl groups by selling more than 34,000 units on the day of its release.

[24][25] Iz*One subsequently became the fourth highest K-pop girl group in first week album sales after selling of about 80,000 copies, as recorded by Hanteo.