Natty was a contestant on the South Korean reality survival shows Sixteen and Idol School, that led to the formation of Twice and Fromis 9, respectively.

[8] Later in February 2023, it was discovered that the agency had applied to trademark Kiss of Life and that they had opened SNS accounts of the same name for the group.

[16] Beginning with "Sugarcoat" by Natty on June 18, solo music videos of "Countdown" by Belle, "Kitty Cat" by Julie, and "Play Love Games" by Haneul were officially released in the following days.

They also held a press showcase at Yes24 Live Hall in Gwangjin District, Seoul on the afternoon of the same day.

[30] On July 23, "Superpower" was released in collaboration with Riot Games, which served as the theme for the 2024 Valorant Champions tournament.

[31] Natty and Julie provide vocals along with Got7's Mark Tuan, and they performed the song live before the tournament's grand finals between Edward Gaming and Team Heretics at Seoul's Inspire Arena on August 25.

[33] On September 25, S2 Entertainment announced that Kiss of Life would be releasing their third EP Lose Yourself on October 15, with "Get Loud" as the title track.

[35] The "Kiss Road" tour started on October 26 and 27 at the Olympic Hall, which featured the unreleased song "Winehouse" in its set.

[39] The members additionally mentioned that they listen to a lot of R&B and hip-hop music, being strongly influenced by artists such as Ariana Grande, SZA, Rihanna, and Rosalía as well.