After participating in a séance, young Laura begins to behave strangely. Alarmed, her parents ask Father Olmedo, one of the few exorcists authorized by the Vatican to intervene in cases of demonic possession, for help.

Pepe is the best person in the world, until he discovers that he has a terminal illness and has months to live. To avoid suffering for his loved ones, Pepe decides to become the worst person in the world and thus keep them away from him so that they don't miss him when he dies.

The Fuentes are not the best family in the world. But what family is it? Work, school and routine have plunged them into a spiral of disconnection that seems impossible to stop. However, everything changes when the youngest of the group, Valentina, makes a wish for her ninth birthday. The next day, all the members of the family wake up with their bodies swapped: The father is in his wife's body, the girl is trapped in the grandmother's body, the teenage twins are not themselves... Chaos takes over. the family and, desperate, they ask themselves: Who is who? While the family faces crazy situations and hilarious circumstances, the Fuentes must learn to get under each other's skin and trust each other to turn the situation around. Will they be able to return to their original bodies and get their lives back?