Armin helps Jennifer prepare her fitness program for City Radio. This brings them closer together. But after his break-up with Lona, Armin is not yet ready to commit to a new relationship. Jennifer is very understanding. Lona is heartbroken. After a conversation with Aylin, she turns up at the radio station and gives the master tape of her video clip into Armin's hands as a token of her love. He struggles with conflicting feelings ... After Stefanie catches her boyfriend Lars in bed with another woman, she runs off aimlessly. It is only on a bridge over the Rhine that her strength fails. Faced with the depths, she makes a tragic decision. Chris, who is driving with a colleague, hears about the potential suicide on the radio. He reaches the bridge at the last minute. Can he stop Stefanie from jumping to her death? ... Laura is firmly convinced that she will soon be able to win Andreas over. By chance, Marc witnesses a conversation in which Jens and Laura talk about their bet. Meanwhile, Alexander has also become suspicious. He warns Laura not to play with Andreas' feelings. But when Laura complains that the Albrechts only ever think the worst of her, Alexander guiltily relents. After a conversation with Marc, who tells him about Laura and Jens' bet, Alexander's mistrust is rekindled. A short time later, he stands in horror in front of the locked door of the community hall, behind which he suspects Laura and Andreas.

Sophie wonders whether she should temporarily rent her apartment to the strange Professor Slanski. Slanski offers her a large sum. Wolfgang persuades her that she can live with them in the meantime and take care of the sick Irene. Finally, Sophie agrees. Slanski and his nephew Kai Sonderhoff move into the apartment in the backyard ... Armin wants to protect Martin from fraudsters and tries to find out what kind of business Dieter Wolf is involved in. His behavior allows only one conclusion: hands off. But Martin is already on his way to a meeting with Dieter. Can Armin stop the transfer of money in time? ... While Antonia makes an effort and reconciles with Marc, Olaf is still looking for a job. Now he hopes for a job for a clinic night watch. To his surprise, however, he is also rejected there - and with a rather cynical reason ... Melanie knows Kai Sonderhoff. He is her childhood sweetheart from her teenage years. What is Kai doing in Cologne?

Melanie is surprised to meet her ex-boyfriend Kai Sonderhoff again in Schillerallee. Both have not seen each other for three years and arrange to meet for the afternoon at the Schiller. Melanie tries to find out what brought Kai to Cologne. But he only gives evasive answers. To avoid the constant innuendos about Chris, Melanie asks Kai to pretend to be her new boyfriend. He doesn't mind ... Armin arrives just in time for the meeting between Martin and Dieter Wolf. He threatens Dieter with the police and forces him to give Martin his money back. A real friendship develops between Armin and Martin. Armin believes that Martin has fallen in love with one of the girls from the shared apartment. But in truth, he is the one Martin is interested in ... Out of anger, Margot reveals that Wolfgang has been paying part of Olaf's rent for months. Olaf is deeply shocked by this. He doesn't want to depend on other people's alms. Wolfgang offers to help him in the bakery.

The very first episode Unter uns.

Jennifer accuses Corinna of being too superficial in dealing with men and not even thinking about the consequences of her behavior. Corinna realizes that she has made mistakes and decides to keep her hands off the men in the near future. For Alexander, this is devastating news. Chris regrets his behavior towards Melanie. He asks her to go out with him again. Melanie is overjoyed. Aylin picks up rumors about Corinna and the shared apartment with Margot. Her curiosity is aroused. When she cleans at the Albrechts, she tries to eavesdrop on Alexander. But he doesn't feel like talking to Aylin about Corinna. The radio presenter Carsten Scholz is dismissed without notice. Armin gets his big chance to moderate a show on a trial basis. Now he has to prove, under the pseudonym 'Franco', that he has more than cool sayings.

Joe exonerates Till and takes all the blame. Irene lets Wolfgang in on the story. He realizes that he was busy with trivial disputes, while his son desperately needed him. Irene notices that Antonia is not feeling well. She makes sure that she can go to her mother in Munich for a few weeks ... Armin excitedly prepares the first tête-à-tête with the singer Lona Dee. But his joy is clouded by a series of misunderstandings ... When Alexander returns from the hospital, Bröcking reveals his plan to the Albrechts. Regina and Joachim are adamantly opposed to letting their son act as bait for the stranger, but Alexander sees no other way out. For Corinna's sake, he wants to finally put an end to the horror. He meets Weissenburg at the agreed place on the Rhine bridge. But then events take a turn for the worse.