After learning about one case with a baby being misplaced at birth in Orenburg, Kisegach becomes obsessed with her (future) baby possible being misplaced as well. Bykov, to snap her out of it, demonstrates to her that it wouldn't be that easy to just "misplace" babies... by trying — and failing — himself. He also tells her that unlike the times when she gave birth to Gleb (in some random place, with random people), now she would deal with professionals. Unfortunately, later Anastasia remembers Bykov's words, and starts fearing that it's Gleb who might've been misplaced. To test it, she needs a sample of his blood. Bykov instead orders Gleb to tell his mother about their "special bond" which only a mother and her child may share, which works perfectly. But then she starts thinking that it's her who was misplaced, and that Marina isn't her real mother. Bykov, who openly hates Marina, plays along, but Marina arrives herself and resolves the problem on her own.
Olga's father, Sergei Vasilyevich, plans to attend their hospital to check up his health... or, rather, to hide away from his (very restrictive) wife for some time. Unfortunately, now both his wife and his daughter believes that there may be something serious (with wife insisting on being constantly presented near him). Semyon barely manages to convince them to not visit him. Sergei decides that since he's away from his wife, he may as well drink alcohol with Semyon. Lobanov tries to ask Kupitman to share some, but he only agrees once he learns about Sergei and decides that Semyon's father-in-law may share some interesting stories. But on his way back from their binge, Kupitman gets busted by Olga, who now thinks that Sergei is here due to cheating on his wife and needing a venereologist. Semyon saves the situation, but Olga forgives him only on condition that he wouldn't try this again.
Polina still can't forgive Gleb, and wants revenge. Just as Gleb "caused" her to lose two boyfriends, she would cause him to lose two girlfriends. Fortunately, Gleb has an unwanted admirer — fat, ugly girl called Katia who's obsessed with him; all he needs to do is to pass her as his girlfriend for Polina. This seemingly works, with Polina proceeding with her "plan"... but then Polina decides that it would be cruel to sabotage their "relationship", and she decides to help them instead, by reassuring Katia: Gleb indeed loves her, just refuses to show it, and she must be more persistent to break his "shell". Gleb certainly isn't happy with it and insists that Katia isn't his girlfriend... and Polina reveals that she knows; but this way, it's even funnier than her original plan.
This episode provides examples of:
- Abhorrent Admirer: Gleb has an admirer he would rather avoid: an ugly fat girl called Katia Kopytova. Extremely annoying initially, she comes handy when Polina decides to ruin Gleb's personal life as revenge. Unfortunately, Gleb was too blatant when he lied to Polina about Katia being his girlfriend, and Polina, instead of sabotaging their "relationship", convinced Katia to be more persistent with Gleb, to Gleb's annoyance.
- The Alcoholic: Actual reason why Olga's father needs to hide from his wife; so he may drink without her noticing. It very well may be the reason why she constantly tries to control his every step.
- Blatant Lies: Gleb mentions how ugly Katia is. Several hours later, he tries to claim that she's his girlfriend, as a plan to deceive Polina. It doesn't fool her, and later backfires on him.
- Comically Missing the Point: Bykov starts talking about cat food, but gets interrupted by Kisegach, who just read about the story when two babies were mistaken at nursery and accidentally switched, only to learn about their biological parents twenty years later. Bykov's reaction? To ask how is this related to cat food.
- Failure Gambit: In order to prove to Kisegach that it's not that easy to just "misplace" babies, Bykov actually switched two babies in nursery. Before Kisegach even finishes stating how irresponsibly it was, one of the nurses finds this out and rushes to them to chew Bykov out; as it turns out, he was caught on cameras (which are presented everywhere). This is exactly Bykov's point.
- Henpecked Husband: Olga's father turns out to be completely subservient to his wife (at least, from his own words); he lied about his health just to have excuse to spend some time away from his way too strict wife, who constantly orders him around and restricts his freedom (he can't even spend time with his friends, due to her ordering him to return home early). She acts this way for thirty years. Unfortunately, the plan goes wrong instantly, due to his wife demanding to be presented near him, and Semyon, in attempt to calm Olga down, only makes her worrying that there may be something serious with her father.
- Hidden Heart of Gold: Invoked; Polina tells Katia that Gleb really loves her, but tries to hide it by acting very rudely, and she needs to be more persistent in order to break his "shell".
- Hoist by His Own Petard: Gleb tries to pass Katia as his girlfriend, hoping that Polina would scare her away and be satisfied with it; instead, Polina recognises his true plan and plays along, convincing Katia that she must try harder.
- Insane Troll Logic: Kupitman's train of logic when refusing to give Lobanov cognac: Semyon would take it and leave, thus he wouldn't drink with him, thus he thinks that Kupitman isn't good enough as a drink buddy, thus screw you, Lobanov. This is before Semyon even started explaining why he needs it. He changes his mind when he learns about Semyon's father-in-law, realising that he may learn something interesting about Semyon's life if he takes part in it.
- Instantly Proven Wrong: When accused of not listening to Olga during yesterday's discussion, Semyon claims that he did, only to being reminded that he forgot that it was about her father. He then claims that he just forgot details and asks whether it was about his car... and gets reminded that it was about his health problems, due to which he must adhere their hospital.
- Like Parent, Unlike Child: When she gets convinced that Gleb is not really her son, Kisegach states him being shorter than either of his parents and much lazier (they both are workaholics). Bykov tries to calm her down, to which she replies with "you see, I'm very emotional, and Victor too; while Gleb cares about nothing!"
- Meaningful Name: Katia's surname is Kopytova (from "Kopyto" — a hoove), adding to the "ugly cow" motif.
- Mistaken for Cheating: When Olga busts Kupitman leaving her father's ward, this, in combination with Lobanov being very secretive about the whole situation, makes her instantly jumping to conclusion that Sergei cheated on his wife (Olga's mother), to the point of requiring venereologist's help. Semyon's attempts to explain only makes her angrier, since she interprets the words he chose as him considering cheating to be "okay".
- Obnoxious In-Laws: When Semyon learns that his father-in-law would attend their hospital, Semyon "jokes" about Olga's mother's health, with predictable reaction.
- Properly Paranoid: Subverted. Marina tells Bykov that Anastasia was right in her suspicions: she isn't Marina's biological daughter; Marina has bought her from alcoholic neighbours by paying them with alcohol. When Bykov starts realising that this actually makes sense, Marina calls him dumbass for believing something so blatantly made-up and asks how someone so naive may be a doctor.
- Relationship Sabotage: Knowing that Polina would try and take "revenge" for indirectly ruining her own relationships with her boyfriends in the previous episode, Gleb tries to fool her by passing his Abhorrent Admirer patient as his girlfriend, hoping that Polina would "break them apart" and think that she'd won. It fails miserably, because Polina instantly realises his plan, and plays along, meaning that now Katia thinks that Gleb really loves her.
- Reverse Psychology Backfire: Gleb pretends that Katia is his girlfriend and tells Polina to not sabotage their "relationship", hoping that Polina proceeds to do exactly the opposite out of revenge (Gleb previously indirectly destroyed her own relationships). Unfortunately for Gleb, Polina instead proceeds to reassure Katia, in attempt to "help" their "relationship". It was not a mistake on Polina's side; she did this intentionally, since Gleb's attempts to pass Katia as his girlfriend just after stating how he hates her merely hours earlier were way too blatant to believe.
- Switched at Birth: Kisegach's entire plot in this episode is her being obsessed with this situation (forcing Bykov to find a way to snap her out of it):
- After learning about one case in Orenburg when two switched at birth babies only learned the truth twenty years later, Kisegach becomes obsessed with her (future) baby possibly being misplaced as well once he gets born. She also constantly calls Bykov via cellphone with suggestions to give birth in other countries (which certainly wouldn't be cheap for them), just because it would be "less risky". Each time Bykov's protests becomes shorter; when she calls a third time, he hangs in the middle of her speech.
- Bykov later convinces her that it wouldn't be that easy to just misplace babies in their hospital (by trying and failing)... but makes a mistake of mentioning how she gave birth to Gleb years ago in some random place without caring much; soon enough she starts worrying that it's Gleb who was misplaced. She even has some "evidences" for it: Gleb is short and lazy son of the tall workaholic parents; even his eyes do not match either her or Victor's, nor is his temperament. Bykov snaps her out of it by ordering Gleb to tell her about "mother's bond with her child" which they share.
- And then, Kisegach decides that it's her who was misplaced, and she isn't her mother's daughter. Bykov decides to not fix this one, stating that "snake can't give birth to squirrel". Unfortunately, he says this just in time for Marina to appear and call him an idiot before proceeding to calm Anastasia down (which takes her some time).
- Unreliable Expositor: Sergei claims that his wife harshly restricts his freedom; but what he intends to do with this "freedom"? To get drunk with his friends. Then he tries to ask Semyon to bring him booze right here. It quickly becomes apparent that his wife not so much "restricts" him as fights with his alcoholism.
- Unseen No More: Olga's father appears in person for the first time, after being repeatedly mentioned in the previous seasons.
- Wacky Cravings: Since Kisegach's "buy me something tasty" was way too abstract, Bykov, just in case, bought even some cat food. It's not clear whether he did this for real or he just mocks her, due to him being angry.
