Written by 3Racha, a production team from members of Stray Kids and HotSauce, the song is described as a hip hop, and trap song with the elements of Korean traditional music (gugak), and brass instruments, expresses the firm belief that they will not be discouraged and keep to their principles no matter what anyone says.

The Japanese version of "Thunderous", titled "Sorikun" (ソリクン), was released on October 13, 2021, together with "Scars" as a double A-side single, through Epic Records Japan.

[8][9][10] On July 30, 2021, Stray Kids announced to release the second Japanese single on October 13 with five physical editions: three first press limited (A, B, C), regular, and FC.

[11][12] On September 10, The Japanese version of "Thunderous", titled "Sorikun" (ソリクン), was announced to release as a double A-side single in Japan together with "Scars".

[15] "Thunderous" was written by the group's production team 3Racha (Bang Chan, Changbin, Han), and JYP in-house production team HotSauce,[4] is a hip hop[10] and trap[10] song that includes various elements of Korean traditional music (gugak), brass instruments, and chuimsae.

Bang Chan also said, "The message of the song is that Stray Kids, as sorikkun (singer), will face off against the jansorikkun (naggers), and confidently let loose our sound.

[34] The music video teasers were released on August 20–21,[5][6] Directed by Bang Jae-yeob,[35] and shoot in cinematic scale, the music video mash-up Korean historical and modern styles, like sports cars in front of the palace, Stray Kids wearing modern clothes among the people in hanbok.

It included Korean traditional culture like aak, pungmul nori, Bukcheong lion mask, etc.

[37] It surpassed 100 million views on October 18, for 55 days, making it the group's fifth 100-million-view music video, following "God's Menu", "Back Door", "Miroh", and "My Pace", and their fastest music video to hit the milestone, surpassing "God's Menu" with 71 days,[38][39] and 200 million views on May 11, 2022.

[60] At the year-end annual music shows, "Thunderous" was performed at the 2021 KBS Song Festival on December 17, which shot at Namhansanseong, Gwangju, Gyeonggi Province with the theme With K-Culture, collaborated K-pop and K-cultural asset;[61] 2021 SBS Gayo Daejeon on December 25, which arranged in Christmas version, and additionally using canes, group dance, and parodying Squid Game's ttakji, and dalgona game;[62][63] and 2021 MBC Gayo Daejejeon on December 31, adding ringing New Year's bell performance before New Year ceremony.

It received a nomination for Best Dance Performance – Male Group at the 2021 Mnet Asian Music Awards.