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. The best advantage of singles is freedom. They can start and end the relationships whenever they want to. Will they have a happy last-twenty-something generations?

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