Caro is the surprise success of the music working group a thorn in the side – after all, there must be no greater celebrity at the school than they do. To restore the natural balance, she spins her threads to ridicule the hated choir. Luzi is bringing against Caro, which is deeply shameful for its members. When it dares to expose Caro in public, Caro plans a campaign of revenge. Only a short time later, Gabriele surprisingly blames Luzi for the damage to the school swimming pool. Bea's fear that Julian might know something dissolves. However, Bea now knows what thin ice she moves on. She therefore decide to entrust herself to her old mentor Gabriele. 
But the two somewhat half-hearted attempts fail on Gabriele's unpredictability. Ben is relieved at first that no one holds him and his classmates accountable because of the burglary in the swimming pool. But this is strange. At home, he has to experience the reason: the father's influence alone protects him from punishment. Despite Stefan's stand-up town, Ben is happy to have got away with a black eye – but somehow it all went a bit too easily

Bea pulls the emergency brake and makes Ben realized once and for all that she cannot have a relationship with a student. For Bea, this line seems to be relieved, although she is not quite sure whether Ben is really taking her announcement seriously. Nevertheless, Bea looks confidently into the future. She does not suspect that there is a risk from completely other sides ... Julian Götting does not like it that Gabriele Krawczyk wants to put the donations he acquired in the music company supervised by Bea. But Julian doesn't give so easily on. When he finds proof of who was responsible for the night party in the swimming pool, he regains hope. He now believes he has a means in his hand with which he can bring Stefan Bergmann to another donation. 
But he doesn't even think about it ... Luzi suffers from the fact that Timo only sees her best friend in her and doesn't even notice her deep feelings for him. But thanks to the music working group and the sensitive work of Beas, she recognizes what can help her over grief...

After Bea learned to her horror that her one-night stand Ben is a student of her's, and the first day at school even present's herself quite differently than Gabriele promised her, she is about to throw away. But Miriam convinces her that all this was just a one-time misstep. But Bea gets an unexpected visit from Ben ... Ben enjoys great popularity on the first day – especially among his classmates. Especially Caro has it apart from him. When the new friends celebrate a wild party in the school swimming pool, Caro puts it all on one card. But Ben's thoughts are completely elsewhere ... Sophie stops with Timo. Timo wants to challenge her, but Sophie lets him flash cold. He then drowns his grief with a lot of beer and does everything to demonstrate to Sophie that he is very amused even without it – but hits the strands...

Bea returns to her old school as a newly minted teacher after the legal traineeship. Full of anticipation, she takes this place, because she only connects beautiful memories with her school days. But the years have not passed without a trace at the Pestalozzi comprehensive school. Much has changed – and not exactly for the better. Unfortunately, only one thing at school has remained the same: Alexandra Lohmann, Bea's personal enemy from school days, is still working there – the two have a dark secret. There was a left-handed evening with her sister-in-law Miriam just right for distraction. But there will be an evening that for Bea, will have far-reaching consequences ... Luzi Beschenko is using the start of the new school year to pursue her idea of creating a music company. 
Unfortunately, due to the shortage of teachers, there is no teacher who could look after this working group. This changes with the attitude of Bea Vogel as a new music teacher. But Bea meets a small group of nerds, who are so impressed by the attacking hostilities of the It girls around Caro that they want to throw their heads int the sand on the first day. Bea has to muster all her persuasive power to change the kids...