So Cool is the debut studio album by South Korean girl group Sistar.

The promotions of the song ended on October 2, in the special episode "Save the Green Earth" of Inkigayo.

One day after the release of the album and music video, Starship Entertainment made some changes in the choreography of the title song "So Cool" to avoid controversies.

[3] The song "Girls Do It" was deemed inappropriate for broadcast due to a seemingly-offensive line.

"Girls Do It" was set for the album's fifth single, however due to the controversy that followed the track, promotions were cancelled.

[9][10] The physical single entered and peaked at number 63 on the Gaon Album Chart.

[13] The music video was released on the same day and features Super Junior's Kim Heechul.

[14] The song was released as a digital single and as a physical single album, including b-sides "Drop the Beat" featuring B2K, "I Don't Want a Weak Man" and an instrumental of the title track for a total of four tracks.

[17][18] The physical single entered and peaked at number 9 on the Gaon Album Chart.

[23] On December 9, Sistar released rehearsal videos for "Over" and "How Dare You", and their homepage crashed due to congestion.

[26][27] The physical single entered and peaked at number 8 on the Gaon Album Chart.