Adriana is a successful wedding planner with a seemingly perfect, but boring marriage. She runs into Sergio, an old friend who she always had a crush on. He hosts a dinner party with a special twist.

The group is left intrigued and excited thinking about the prospect of the key game and what would happen if they decide to participate. Adriana decides to take action and gets her friends together again…will they play?

The four couples swap partners; the key game has begun. All seems fun, until things quickly go off the rails…and the party ends in jail.

Adriana remains obsessed with the idea of the key game, while her husband Oscar, tries to convince her to give up and rebuild their relationship instead. Sergio's constant presence will test the couple’s strength.

Fantasies are unleashed: Adriana uses one to try to spice up her marriage, and Sergio calls for another key game. Leo fantasizes about his children’s nanny, and Valentin faces a fundamental problem that could change his marriage…forever.

It's the old vs the new when Siena and Sergio host a new key game with two generations of players. But the rules of the game start to blur and feelings start to grow.

Adriana and Sergio head out for special throwback concert, while Oscar and Gaby celebrate Mika's birthday… sparks are flying, but is someone going to burn themselves?

Tensions at work between Oscar and Sergio come to a head, while Adriana and Barbara deal with their own work place disaster. Have the game players played themselves?

Siena throws an elaborate masked "Key Game" where sex, passion, and desires meet- and all the couples are forced to play for the highest stakes possible.