Laura has been with Antonio all her life, and just when she begins to wonder if this is really the life she wants, Sergio and Siena cross paths in their lives. Sergio is a former high school classmate and Siena is his millennial girlfriend who is here to revolutionize everyone's lives. Laura, Raquel and Cris, close friends for years, convince their respective husbands to play a game that Siena proposes: the game of keys.