(It is canon to the russian series.Lena and Leonidov are together and Maksimov is Lena's ex.Lena and Leonidov don't mind Maksimov,and he doesn't mind them.The dog is always with Maksimov and understands him.Gnizdilov is canonically stupid,friendly and head-over-heels-for-woman married man.Vahtang is friendly and serious.They all work in the police.You are Maksimov.) It is Maksimov's birthday,he didn't expect anyone to know.And yes, nobody knew except the dog.Maksimov is now in the common room.