Fien has to look after Luuk, but decides to meet with Demi. When she comes home it is not Luuk, but an unknown boy at the door. She has to find Luuk before her parents come home.
Fien and Demi go to steal lipstick, but then Fien sees her father and brother in the store. When Demi laughs at her brother at school, Fien joins in hard. Fortunately, Demi does not know that he is her brother.
It is Fien's birthday and she is going to visit the hospital with Grandpa and Luuk. Luuk turns the hospital upside down, but Fien manages to save the situation. Fortunately, grandpa is there to put Fien in the spotlight again.
Fien decides to go to Luuk's party with Grandpa. This way she can give Luuk a taste of his own medicine. When they get home, her mother becomes furious. Grandpa stands up for Fien and gives his opinion.
Fien is in the hardware store and plays a prank on Luuk. Then, Demi suddenly appears in the aisle. Fien makes up a bunch of lies, but Demi finds out that Luuk is her brother.
Fien is terribly sad when Demi gives a speech about virals, with a video of her brother. When Demi even starts bullying her, Luuk is the only one who knows how to comfort Fien.
Fien decides to tell everyone at school about her brother by giving her a presentation about him. When she takes him to the prom, Demi comes around and speaks with Fien about their argument.