On June 30, 2010, both "Bad Girl Good Girl" and their first EP Bad But Good were released.
Music video
On June 30, 2010, the music video for the song was released online. The music video features the girls in a school, dancing in sync.
Performances
The group had their debut performance on July 1, 2010, with "Bad Girl Good Girl" on MnetM! Countdown. They were number one for the first time on M! Countdown on July 22. Miss A became number one again on KBSMusic Bank the following day on July 23 and on SBSInkigayo on August 1. "Bad Girl Good Girl" was awarded Song of The Month on Cyworld, one of the biggest Korean music portals.
^"신예 미스에이, 백지영 손담비 등 선배들과 경쟁서 당당한 1위" [Newcomers Miss A Battle Veterans Son Dambi and Baek Ji Young for #1]. Newsen (in Korean). July 12, 2010. Retrieved October 15, 2023.
^"걸그룹 미스에이 '배드걸 굿걸' 돌풍...2주 연속 1위" [Girl Group Miss A's "Bad Girl Good Girl" is Two-Week #1]. Gwangnam Ilbo (in Korean). July 20, 2010. Archived from the original on March 3, 2012. Retrieved October 15, 2023.
^"지난 시상식, Page 4". Digital Music Awards (in Korean). Cyworld. Archived from the original on July 1, 2015. Retrieved June 13, 2019.
^"역대 수상". Golden Disc Awards (in Korean). Archived from the original on December 6, 2019. Retrieved January 20, 2022.
^"2010 Mnet Asian Music Awards Winners | 2010 MAMA". Mwave. Archived from the original on November 25, 2021. Retrieved August 22, 2023.
^"Seoul Music Awards Past Winners". Seoul Music Awards (in Korean). Retrieved August 22, 2023.
^‘제 1회 한국음악저작권대상’ 가수-제작자 화합의 장 ‘성료’. The Korean Herald (in Korean). December 4, 2011. Archived from the original on April 26, 2012.
^Lee, Min-hee. "2010 Best Dance and Electronic Song Winner – Bad Girl Good Girl". Korean Music Awards (in Korean). Retrieved August 22, 2023.
^"2011 Song of the Year Nominee – Miss A 'Bad Girl Good Girl'". Korean Music Awards (in Korean). Retrieved August 22, 2023.
^"Gaon Search - miss A" (in Korean). Gaon. Archived from the original on June 15, 2012. Retrieved June 1, 2010.
^"Gaon Digital Chart of 2010" (in Korean). Gaon Music Chart. Archived from the original on November 30, 2020. Retrieved July 16, 2017.
^Cumulative sales for Bad Girl Good Girl:
2010년 Download Chart. Gaon Music Chart (in Korean). Archived from the original on October 2, 2013. Retrieved May 14, 2017.
2011년 03월 Download Chart. Gaon Music Chart (in Korean). p. 3. Archived from the original on August 16, 2016. Retrieved May 14, 2016.
2011년 04월 Download Chart. Gaon Music Chart (in Korean). p. 4. Archived from the original on August 16, 2016. Retrieved May 14, 2016.
2011년 05월 Download Chart. Gaon Music Chart (in Korean). p. 4. Archived from the original on August 16, 2016. Retrieved May 14, 2016.
2011년 06월 Download Chart. Gaon Music Chart (in Korean). p. 4. Archived from the original on August 16, 2016. Retrieved May 14, 2016.
2011년 07월 Download Chart. Gaon Music Chart (in Korean). p. 4. Archived from the original on August 16, 2016. Retrieved May 19, 2016.