Written and produced by Teddy Park and Kush, the song was released as the EP's second lead single on July 1, 2009, by YG Entertainment.

It features the members visiting a fortune teller who then freezes time in order to play sabotage on their cheating boyfriends.

A Japanese-language version of the track was additionally recorded and included as part of the group's first Japanese studio album titled Collection, which was released by YGEX on March 28, 2012.

[4] The release of "I Don't Care" marked a switch in image for the group, in comparison to 2NE1's debut single "Fire" earlier in the year, which carried a bold and fierce concept.

According to YG Entertainment, "I Don't Care" was intended to possess a concept that focused on enhancing femininity rather than intensity, simultaneously allowing for a more "public friendly" image.

[5] Musically, the song has been characterized as a medium-tempo pop track, containing a somewhat softer melody as compared to the group's debut single, in addition to incorporating influences of R&B and reggae.

It was reported that through "Fire", it showed that reggae could work well in Korea, and "I Don't Care" aimed to further advance reggae-like styles into the country's mainstream music scene.

The group achieved their first triple crown (or three total wins) with the song on Inkigayo, and further led the Music Bank and M Countdown chart for multiple weeks.

[14] "I Don't Care" won 12 first place trophies on domestic music programs, including triple crowns on M Countdown and Inkigayo.

The music video for "I Don't Care" premiered on Melon on July 9, 2009, and was uploaded to YG Entertainment's official YouTube channel on August 27.

The performance was met with positive reception among netizens, who complimented the youthful choreography matching the soft reggae melody, and further praised 2NE1 for their ability in showcasing a "different charm".