Two friends go to St. Petersburg on a business trip that will change them forever. Completely different, like ice and flame, guys fall in love with two Petersburgers equally strongly. Reliable and pedantic Kostya loses his head when he meets an eccentric Game. And the freedom-loving lovelace Sanya for the first time thinks about a real relationship, having met the mysterious cellist Nastya. Love turns the measured lives of Muscovites upside down — and none of them knows how to deal with this new feeling.