His passion for salmon pie leads Boyan into a love triangle that he didn't sign up for at all. Maria Pavlovna's neighbor, Leonid, sees in him a romantic rival and opaquely hints that he is ready to fight for the favor of the mathematician. To somehow explain the unexpectedly cold attitude towards his colleague, the Serb has to play out a story about a jealous girl. Natalia is also trying on a new role: the historian suggests that she embody the image of the bloody landowner Saltychikha, but she copes even too well.

Egor has another rap battle coming up. This time, Nastya alone is not enough — it's time to seek help from a higher-ranking specialist. The whole school knows that Maria Pavlovna has no equal in diss: she wrote them even before she found out about the existence of such a word. While her mother is busy verbally humiliating her, Natalia is trying to figure out which stain is more terrible for her — on her clothes or on her reputation.