The Russian melodramatic series "I Swear to Love You Forever" tells the story of the main values that occupy a fundamental place in everyone's life - love, loyalty, and friendship. It is often very difficult to preserve and carry them through the years. At the center of the events is a young and beautiful girl named Lena. From an early age, she has been involved in swimming and has achieved success in this sport. All the residents of Primorsk are proud of their fellow townsfolk and predict a brilliant future for Lena.