Written by 3Racha, KM-Markit, and Armadillo, it shows the group's determination to continue to make deep and large scars to grasp a bigger dream even though they have a lot of them.

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

[5] Stray Kids released the Korean version of "Scars" as a lead single of the compilation album SKZ2021 on December 21.

[8] Lyrically, the song expresses Stray Kids' determination to continue making deep and large scars to grasp a bigger dream even though they already have a lot of them.

[14][19] For international charts, "Scars" landed at number 7 on the Billboard World Digital Song Sales in the week ending October 16, 2021,[20] making Stray Kids' fifteenth top ten song on the chart,[21] and entered 40th week of Hungary's Single Top 40 at number 11.

[28] The Korean version was performed for the first time at the group's second fan meeting 2nd #LoveStay 'SKZ's Chocolate Factory', which was held on February 12–13 at Olympic Hall.