Melanie moves into the attic apartment and immediately gets a taste of the 'free shared apartment life' when she enters the bathroom without knocking and faces the naked Armin. Jennifer reassures Melanie that Armin is completely disinterested in women. When Melanie meets Chris a little later, she begins to rave hopelessly for him. The object of her shy dreams, however, prefers to meet Corinna, with whom he spends a romantic evening. Till is amused by his big brother, who is usually quite harsh with women, but doesn't get any further in this respect with Corinna. Armin reacts jealously to the developing relationship between Chris and Corinna. In addition, he is a little too casual with his financial problems. Bills are piled up on his table. Laura wants revenge on Antonia and smuggles the fountain pen of a classmate into her pocket. The fountain pen is promptly discovered and Antonia is accused of theft. No one but Marc believes their protestations of innocence. Antonia knows to whom she owes all this and plans a revenge action, which, however, goes down the drain.