Businessman Igor Vetrov is going on a long business trip. On his girlfriend Lydia's birthday, he sends her an engagement ring by courier so that they can celebrate their engagement when he returns. But due to a misunderstanding, the ring ends up with a neighbor – a singer who is spoiled by attention. Before Vetrov's arrival, the girl loses hope of waiting and accepts the proposal of their mutual friend Alexander, who knew nothing about her romance with Igor! Out of jealousy, Vetrov introduces his friends to his fake fiancée, Maria. Masha quickly gets into the game, but at the same time realizes that it would be foolish not to take advantage of the situation when she has such an enviable fiancé nearby… although, perhaps someone will find happiness in this strange love quadrangle?