Early morning of January 1, 2016. Oscar goes to a nightclub with his ex-girlfriend, Vero, believing he still has a chance with her; but he is wrong. It is the same discotheque where Ana works as a waitress. When the disco closes, Ana and Oscar meet at a bar.

December 31, 2016. Ana has signed up for the dinner that Guille and Ali have organized at her parents' house in the mountains. Óscar has a tense relationship with Vero. Ana has been dating Javi for about five months. While they wait for Oscar's father to arrive, they entertain themselves with a game during which all the tensions of the night will explode.

January 1, 2023. Óscar is in bed with a colleague from the hospital. They've been seeing each other for a couple of weeks. But as he leaves his house, he runs into Ana. She’s come to Madrid for a few days, for Christmas. They’re both in a hurry, but they have a coffee together. It’s been almost three years since the last time. Ana doesn’t know how to tell him something, so she blurts it out all of a sudden