The app developer Samuel has developed an algorithm to find his perfect partner. In a stolen data set, he comes across Lina, a waitress who is as chaotic as she is mysterious. Sam and Lina are at the center of the family comedy series Big Dating. App developer Samuel (Ole Fischer) no longer trusts his own feelings. Instead, he wants to find the perfect woman for him with the help of an algorithm he developed himself. His ideal partner is - surprisingly - Lina (Olga von Luckwald), a singing waitress with a penchant for spontaneous actions. Samuel throws himself head over heels into the new relationship. Supported by his two best friends Inga (Anna Schimrigk) and Henner (Leon Ullrich), who are about to become parents, Sam manages to win Lina over. But the mysterious algorithm has long since begun to change everyone's life.