[3] On April 25, the track listing was released, with "Fearless" announced as the lead single,[4] followed by a highlight medley video two days later.

[8] "Fearless" was written and composed by Score (13), Megatone (13), Supreme Boi, Blvsh, Jaro, Nikolay Mohr, "Hitman" Bang, Oneye, Josefin Glenmark, Emmy Kasai, Kyler Niko, Pau, and Destiny Rogers.

[46] The Japanese version of "Fearless" debuted atop of the daily ranking of the Oricon Singles Chart on its first day, selling 132,621 physical copies.

[47] It finished at number one on the weekly Oricon Singles Chart with 222,286 units sold, while Billboard Japan recorded 321,717 sales from January 23–29, 2023.

[48][49] The single was later certified double platinum by the Recording Industry Association of Japan (RIAJ) for selling over 500,000 units.

[50] Following the release of Fearless, Le Sserafim held a live showcase on the same date to introduce the extended play and communicate with fans.

[61] The Japanese version of "Fearless" was performed on the 73rd NHK Kōhaku Uta Gassen music program on New Year's Eve in 2022.

[62] Le Sserafim's win on the May 13 broadcast of KBS' Music Bank was met with controversy after allegations of score manipulation surfaced.

According to Segye Ilbo, the program received complaints regarding fellow first place nominee Lim Young-woong's score of zero in the broadcast category.

[68] On February 10, 2023, police investigation concluded that KBS were not guilty and that Le Sserafim rightfully won their first place trophy on Music Bank during the May 13, 2022, broadcast.