On New Year's Eve, a group of friends decides to celebrate with a little vodka and songs in a sauna. Amidst laughter and toasts, one of them, a doctor named Zhenya, says goodbye to his friends and prepares to head home. However, in an unexpected twist, after a couple of drinks too many, Zhenya takes a taxi and accidentally ends up at the home of a woman named Nadya, whom he has never met. Due to his drunken state, he confuses the building where he lives, and instead of returning to his own home, he wakes up in a completely unfamiliar place.
Nadya, who is engaged to another man, is shocked to find Zhenya in her apartment. Throughout the night, amidst misunderstandings and comedic situations, they both find themselves caught in a series of encounters and conversations that call into question their love lives. As Zhenya tries to regain his life and return to his fiancée, he realizes that there is something special between him and Nadya. Emotions flow, and laughter ensues, as the story unfolds in a setting full of tradition and satire about love and relationships in Soviet society.
With a touch of romance, comedy, and a good dose of confusion, this Russian classic immerses us in the entanglements of everyday life, where a simple mistake can change everything.