The album's singles "Unforgiven" and "Eve, Psyche & the Bluebeard's Wife" peaked at number two in South Korea and were certified gold for streaming in Japan.

The group's name, Le Sserafim, is an anagram of the phrase "I'm Fearless"[5] as well as a reference to the heavenly beings with six wings, seraphim.

[13][14] After finishing in second and tenth place, respectively, Sakura and Chaewon were named to the final lineup of the show's project girl group Iz*One,[15] promoting as members until its disbandment on April 29, 2021.

After passing an audition, she was personally scouted by Big Hit Music founder Bang Si-hyuk during her studies at Dutch National Ballet Academy in the Netherlands.

[19] Kazuha also previously attended the Bolshoi Academy in Moscow, Russia and the Royal Ballet School in the United Kingdom.

[21] On March 14, Source Music announced that they would launch a new girl group, with Miyawaki Sakura and Kim Chaewon set to be the first members.

[30] On April 13, Source Music announced that Le Sserafim would release their debut extended play (EP) Fearless, on May 2.

[35] On May 20, Hybe Corporation and Source Music issued a joint statement regarding Kim Garam's bullying allegations, announcing that she would take a hiatus due to the pending investigations and that Le Sserafim would temporarily promote as a five-member group.

[38] The album reached number 14 on the Billboard 200, making Le Sserafim the fastest K-pop girl group to debut on the chart.

Simultanously Twice's EP With YOU-th enetered the Billboard 200 list at No 1 which marked the first week where two all female kpop acts were featured in the top 10.

[58] On July 10, the music-themed Grammy Museum in Los Angeles, California announced that a special K-pop exhibit will take place in August 2024, displaying the accessories and performance gear worn by artists under Hybe, including Illit, Le Sserafim, Fromis 9, and BTS.

[60] The English version and various remixes for the lead single of the same name, including a collaboration with American performer Dashaun Wesley, were released on September 2.

[66] On November 10, the group made their very first appearance at the MTV Europe Music Awards with a performance of "Chasing Lightning" and "Crazy".

[72] Their debut act places Le Sserafim in a campaign for a bag capsule exclusive to the South Korean market, against a visual backdrop of Jamsugyo Bridge.

[73] In April 2024, the five members were dressed in custom-made outfits designed by Louis Vuitton's Nicolas Ghesquière for their Coachella debut.

[75] In August, the group was selected as the new advertising models for Mom's Touch, the #1 fried chicken franchise brand in South Korea.

The campaign includes the song "Star Signs", which was released on November 12, as well as a merchandise raffle, a pop-up shop in Lumine's Shinjuku location, original visuals directed by Yuni Yoshida, and more.