Seva and Oksana are over forty. They have three children, a large apartment in the center of Moscow, and both have established careers. An enviable life, they are an exemplary couple. Caught in the midst of minor conflicts, accumulated claims and low self-esteem, Oksana cheats on Seva for the first time in 20 years of marriage and ... confesses this to her husband. Instead of the inevitable drama, Oksana suggests that Seva try... an open marriage. Seva reluctantly agrees, because he himself has been living by double standards for a long time, he has a mistress, his youngest son's teacher. After all, it's a win-win for him. Spouses step into the uncharted territory of an open marriage — hello, freedom!