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The picture of beauty and composure, forty-something mother and wife Na Mi (Yoo Ho Jung) seems to have achieved the ideal life. One day, she bumps into her old high school friend Chun Hwa (Jin Hee Kyung), who is hospitalized with terminal cancer but still as sassy as ever. They reminisce about their high school days together 25 years ago. Back then, Na Mi (Shim Eun Kyung) was the quirky, small-town girl who just moved to Seoul, and Chun Hwa (Kang So Ra) was the tough fighter who welcomed her into the "Sunny" crew. Along with chubby Jang Mi (Kim Min Young), foul-mouthed Jin Hee (Park Jin Joo), bookish Geum Ok (Nam Bo Ra), Miss Korea wannabe Bok Hee (Kim Bo Mi), and arrogant beauty Su Ji (Min Hyo Rin), the girls picked fights with rival cliques and danced their teenage hearts away. They vowed to be friends forever, but adolescent breakdowns and the advent of adulthood would send them all down different roads. As Chun Hwa's health worsens, Na Mi sets out to round up the Sunny crew for one more dance.