Ana turns 30 on New Year's Eve, and she still hasn't figured out her life: she lives in a shared flat, she doesn't like her job, she often changes friends... Óscar turns 30 on New Year's Eve and has his life pretty much sorted out: he loves being a doctor, has loyal friends, and a relationship that comes and goes. On the night they both turn 30, they meet, fall in love and start a relationship with ups and downs that will last for ten years.

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