One of New Year's Eve evenings, Alexei makes a marriage proposal to the charming and sweet Katya. The girl in the seventh heaven from happiness. She had been waiting for this for a long time. But their bright future has one serious obstacle - a loving mother. Mom Katya Zoya Andreevna - a woman of a difficult character - takes this proposal as an encroachment on her private property and easily finds a way to upset the relationship of lovers. But her plan crashes.