Ania, played by Agnieszka Więdłocha, is a 27-year-old single woman working as a music teacher at an elementary school. Her life takes an unexpected turn when she decides to try online dating, but her first experience is a failure when her date, known as "Ant_Man," fails to show up. While waiting, she is noticed by Maciej Stuhr as Tomek Wilczyński, a highly successful TV host and puppeteer. Being accustomed to immense popularity with women, Tomek views Ania's vulnerability as an easy opportunity for conquest. He attempts to use her unfortunate situation to manipulate her into sleeping with him, but Ania is completely unimpressed by his brusque demeanor. She firmly informs him that she expects knightly behavior from any man who wishes to pursue her.
Driven by a mix of ego and inspiration, Tomek creates a puppet named "Hania" for his television show, designing her to look exactly like Ania. He uses the character to mock Ania's beliefs and personality. The sketches become an overnight sensation, leading the network to move the show to a primetime slot. This sudden shift in the show's direction leads to the replacement of Piotr Głowacki as Marcel Galiński, the show's producer and a longtime friend of Tomek.
Needing more material for the "Hania" segments, Tomek tracks down Ania and proposes a business arrangement: if she continues to go on online dates and provides him with the stories, he will donate a brand new piano to her school. Ania agrees and begins using the dating app "Planet Single". While the sketches are a hit, Ania forms a genuine connection with a user named "Bitter-Sweet." They share friendly conversations, though "Bitter-Sweet" refuses to meet in person, insisting that they only chat for the time being. Meanwhile, Ania's relationship with her estranged mother, Danuta Stenka as Krystyna Kwiatkowska, remains strained, as Krystyna strongly disapproves of her daughter's online dating habits.
The plot thickens when "Ant_Man," whose real name is Michał Czernecki as Antonio, reaches out to ask for a second chance. Ania agrees to meet him and finds herself genuinely liking him. Antonio explains the reason for his initial disappearance: he has been a widower for several months and was caring for his daughter. When Ania mentions Antonio to Tomek, the latter—who has unknowingly begun falling in love with her—becomes jealous. He convinces himself that Antonio is a manipulator and that his tragic backstory is far-fetched.
In a desperate attempt to "save" Ania, Tomek and Marcel track down a woman they believe to be Antonio's wife. They interrupt a second date between Ania and Antonio, with Tomek recording the entire event and loudly accusing Antonio of being a cheater. However, the plan backfires spectacularly when it is revealed that the woman is actually Antonio's sister. Heartbroken and disgusted by Tomek's cruelty, Antonio leaves. Ania is furious, scolding Tomek and declaring that she never wants to see him again. Disillusioned by Tomek's behavior, Marcel resigns from his position.
Shortly after, Antonio visits Ania to tell her that he cannot continue dating her; the chaos caused by Tomek made him realize he is not yet emotionally ready for a new serious relationship. They part ways on friendly terms.
As the final episode of the show approaches, Tomek is horrified to realize that the recording of the disastrous date is scheduled to air. Seeking redemption, he enlists the help of Marcel to hijack the broadcast. Instead of the embarrassing footage, Tomek airs a montage showing that several of "Hania's" past dates actually found love because of their failed experiences with her. Tomek delivers a heartfelt speech, praising "Hania" for being brave, honest, and confident—qualities he admits he lacks. He describes her as an everyday hero and warns the audience against ending up lonely as he did.
This public confession moves Krystyna, who finally reconnects with Ania. At home, Ania sees that "Bitter-Sweet" has been trying to reach her and agrees to a date. To her surprise, "Bitter-Sweet" is revealed to be Tomek, who arrives dressed in full knight's armor. He confesses his love for her, and the two share a romantic kiss.
Parallel to this, the story follows Weronika Książkiewicz as Ola, a hairdresser and close friend of Ania. Ola is fired from her job after ignoring her customers' requests to impose her own "professional" vision on their hair. Her boyfriend, Tomasz Karolak as Bogdan, the director of Ania's school, is frustrated by Ola's lack of discipline. Adding to the tension is Joanna Jarmołowicz as Zośka, Bogdan's daughter, who hates Ola and blames her for the departure of Bogdan's wife.
Ania discovers that Bogdan has a profile on "Planet Single", leading Ola to believe he is cheating. To catch him, Ola creates her own fake profile and begins chatting with "Bogdan." However, it is revealed that the profile was actually created by Zośka to manipulate the couple into breaking up. Bogdan, seeing Ola's fake profile, assumes she is the one cheating. This culminates in a loud, public argument when Bogdan follows Ola to a fake date. Zośka records the breakup and posts it online, and Ola moves out of the apartment.
Eventually, the guilt consumes Zośka. She realizes the damage she has caused and visits Ola to confess the truth about the fake profiles. While Ola initially refuses to return to Bogdan, realizing they may not be compatible, a series of events—including a coincidence involving one of Hania's former dates and a moment where Zośka accidentally calls Ola "mom"—softens her heart. This leads Bogdan to contact Ola once more, and the three eventually reunite as a family.
