[8] Im Na-mi, a wealthy but depressed housewife, feels disconnected from her family and lonely in her seemingly perfect life.

Initially ridiculed for her country accent and appearance, she befriends Ha Chun-hwa and joins her group of friends called "Sunny."

The group consists of six other girls: Kim Jang-mi, Hwang Jin-hee, Seo Geum-ok, Ryu Bok-hee, and Jung Su-ji.

Jang-mi is a struggling insurance agent, Jin-hee's husband cheats on her, Geum-ok is unemployed and living in a cramped space, Bok-hee has turned to prostitution, and Su-ji remains elusive.

They celebrate Chun-hwa's life by dancing to their old routine, and Su-ji makes a surprise appearance, completing their reunion.

The flashback scenes juxtaposed the fun and silly, drama-filled lives of high school students with the Gwangju Uprising that took place in May 1980.

The album is comprised by instrumentals composed by music director Kim Jun-seok that express the characters' emotional state.

[12] It also received a limited release in the United States in July 2011, screening in Los Angeles, Torrance, New York City, New Jersey, Chicago, Virginia, Washington D.C., Seattle, Texas and Hawaii.

A Vietnamese remake of the movie, titled Tháng Năm Rực Rỡ (Go Go Sisters) was released on 9 March 2018.

It topped the Southeast Asian country’s box office in its opening weekend (collected 490,000 views) and received overwhelming positive feedbacks from the media, movie reviewers, and public audiences.