Several high-school students graduated in 1989. María Laura Falsini was the girlfriend of Pablo Catáneo, the school's bully. She saw him having sex in the bathroom with another girl, and left the graduation party. Andrés Goddzer helped her to leave the school premises, and they had sex at his car. María Laura got pregnant, and his father Clemente Falsini (owner of McCan, a successful dog food firm) ordered her and Pablo to get married and raise the kid, unaware of the one-night relation with Andrés. Then, the story jumps forward to the present. Pablo works at Clemente's firm, and Andy is a slacker without a stable job, who is hired to take dogs for a ride. María Laura met him by chance and hired him to deal with her family dog, and remembered the 1989 event. A DNA test confirmed that Martín, María Laura's son, was the biological son of Andrés, and not Pablo. This relation is the basic plot of the series. Andrés tries to adjust to his newfound paternity, Pablo resents the advances of Andrés, Martín tries to stay in good terms with both of them, and María Laura begins a romance with Andrés. Furthermore, Pablo cheats María Laura with Patricia, Clemente's secretary and wife. Patricia got pregnant of Pablo, but claims that Clemente is the father of her son.
The Goddzer is a Jewish family, with the parents Elías and Dana, and Andrés' sister Gabriela. Gabriela works at McCan, and has several ill-fated romances. Andrés maintained the friendship with 2 high school classmates, "Tuca" Pardo and Verónica Diorio, who runs a radio of 1980s Argentine rock. María Laura also kept her high-school best friend, the psychiatrist Victoria Lauría, a bachelor who seeks a couple to have a son with. Guillermo Almada, another high school classmate, took a job in McCan as well, and came out of the closet during a graduates meeting. Clemente's secretary Patricia is, unknown by everybody else, another former classmate. She was an obese girl who became thin with a special tr
