Armin's plan to simulate a flood of listeners by means of fictitious calls from the flatmates fails. The trick is exposed, and he loses an important advertiser. Melanie gives Armin the idea of focusing more on his journalistic skills in order to stop the loss of listeners ... Margot got caught up in the idea that Werner owns a piece of land with an ancient Inca treasure. At first, Wolfgang and Joachim joke about her gullibility, but when Margot inquires about Chilean vaccination regulations, Wolfgang stops her in her travel preparations ... For Marc, Till and Antonia, the day of testimonies has come and with it the well-deserved holidays. But when the kids are celebrating their holidays with an ice cream at the Schiller, Wolfgang comes by with a letter that dampens their mood: Krollmann sends them a large bill for the demolition of the tree house.