Na-nan has known best pals Dong-mi and Jung-joon since childhood, and now the trio shares the ups and downs of their turbulent single lives together. But everything gets turned on end when Dong-mi and Jung-joon end up in bed! Should the longtime friends make it official or call it a mistake? Na-nan has a job offer and a marriage proposal from the charming Soo-heon to consider, and her twenties are fast coming to end.


What's a generation of soon-to-getting-older youth to do?
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Jang Jin-young
Na-nan

Lee Beom-soo
Jeong-jun

Uhm Jung-hwa
Dong-mi

Kim Joo-hyuk
Su-heon

Han Ji-hye
Ji-hye

Song Jae-ho
Dong-mi's Father

Jo Hee-bong
Director Cheon

Oh Ji-hye
Restaurant Manager
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