Sergeant of the border troops of the KGB of the USSR Aleksandr Belov (Sasha Belyy), who is serving on the border with Afghanistan, is transferred to the reserve and returns home to Moscow. He is greeted by three faithful childhood friends - the eccentric major and the son of a professor of astrophysics Kosmos Kholmogorov (Kos), the cunning and enterprising Viktor Pchyolkin (Pchela) and the calm athlete Valeriy Filatov (Fil).

After defeating Mukha, Aleksandr Belov continues to live away from crime, and still plans to enter the Mining Institute. He also goes to buy a dog for himself, during the purchase of which he meets the famous stuntman and film actor Aleksandr Inshakov. Sasha does not suspect that he was on the list of Kaverin's personal enemies. Toiling from idleness, Sasha pays attention to the neighboring house, where the young violinist Olga Surikova is preparing for a performance. Sasha falls in love with her.

Kosmos, Pchyola and Fil are called by the investigator to testify, during interrogation they deny both Belov's involvement and their presence in the underground fight. Belov, disregarding conspiracy, follows Olya to Moscow, where he is present at her performance at the conservatory. Young people get to know each other, Olya likes a direct, but self-confident guy.

Cosmos and Phil drive off for alcohol. Summoned by the district police officer, they cordon off the dacha, Sasha refuses to surrender, and shooting begins. Pchela and Belov run away from the dacha into the forest, but Sasha is wounded.

Sasha and Olya are getting married. Pchyola, Fil and Kosmos give young people an apartment as a gift. But on their wedding night, the young people almost die because of a stretching trap, to which a grenade is attached. Sasha notices the threat in time and almost manages to neutralize it, but because of the neighbor's dog, the grenade falls, and Sasha throws it down the stairs, where the explosion occurs.

Sasha Belyi meets his army friend Farhad, who has become a crime boss in his homeland. Farhad offers an army friend a joint business, White agrees. Kaverin is expelled from the authorities, and Artur is forced to go abroad. At the same time, a coup d'etat begins in the country.

Sasha returns from America and makes a deal with Farhad and agrees to enter the drug business. Olya gives birth to a son. Kaverin helps to disrupt the deal with the Tajiks.

Having broken the drug deal, Kaverin begins to play a double game against Belov. After the murder of Farhad, he brings money and drugs to the crime boss Bek, and then "surrenders" Bek to Belov. At the same time, Kaverin passes compromising information on Belov to the special services, however, without expecting it, he himself falls under their supervision. Thief in law Luka invites Belov to engage in the arms trade. Intelligence officers recommend accepting Luke's offer. Alexander refuses. Using connections in the government, Belov is going to legalize his business. By order of Luka, a daring attempt is made on Sasha. He is forced to hide.

Belov hides his family outside the city. Sasha's mother is dying of a heart attack. Olya is in deep despair. Luka makes another attempt to meet Sasha.

A frank conversation takes place between Cosmos and Belov. Cosmos confesses that he killed Mukha in order to save Sasha from certain death. After this conversation, Belov realizes that his friends are still faithful to him. Before leaving for Chechnya, Kaverin openly tells Belov about his hatred. Using connections in the government, Belov disrupts the supply of weapons.

To conclude another deal, Pchela is going to fly to Germany. On the way to the airport, the car in which his friends were traveling exploded. Belov gives the order to urgently find Pchela.

Olga meanwhile comes to Anyuta's home and confronts her, forcing to abandon the affair with Sasha, and to return the camera. At the hospital Pchyola is met with Bely and Kosmos holding pistols, they are interrupted by a nurse asking for anyone with Type B negative blood for Fil.

Suddenly, Belov finds out that Kaverin is alive, and, having returned from Chechnya, he is going to get involved in big politics. Implacable enemies become rivals in the political arena.

Kaverin is trying to overtake the enemy in the election race. Sasha is advised to appear on flyers with his family, he asks Olya for help. At the final stage, Sasha gives a speech that convinces people to make a choice in his favor.

Belov is informed of the murder of Phil and his wife Tonya in the hospital. On the day of the funeral of Cosmos, Pchela, Phil and Tonya, the car in which the Belov family was supposed to arrive explodes. Kaverin and Arthur, guarded by Max, are building a shopping center.