[2][3] The group released two pre-debut digital singles—"My Heart Skip a Beat" in November 2020, and "Can We Talk Again" in February 2021—before their official debut on March 15, 2021, with the EP Into Violet.

The channel introduced all seven future members of Purple Kiss, alongside other trainees who were not added to the final lineup.

During and prior to this period, multiple members appeared on various Korean reality shows and participated in other domestic activities.

[13][14] On November 2, 2019, they accompanied Mamamoo's Moonbyul to perform for charity at the Seongdong Fashion Sewing Village Festival.

[15][16] In their later trainee days, members participated music projects such as LunCHbox, with Dosie, Swan, and Go-eun joining the line-up of featured artists.

[21] On May 26, 2020, the entire group appeared as dancers in Onewe's "End of Spring" music video, alongside Oneus.

[28] The song received positive attention from Korean media, and featured choreography created by the members as well as an original rap section written by Yuki.

The single, a subdued R&B track, contrasted significantly with the rock-inspired "My Heart Skip a Beat", meant to showcase the group's musical versatility.

[35] The lead single was co-written by Yuki, alongside labelmate CyA, with the group having writing and composing credits for most of the songs on the album.

[43] On April 27, it was announced that member Yuki would be participating in the Mnet survival show Queendom Puzzle,[44] where she eventually placed 3rd overall, debuting in the group El7z Up.