In a city where modern relationships are complicated and carefully made plans can change in an instant, Kassie, a woman in her 30s, decides it's time to take a big step: she wants to become a mother. However, after several disappointments in love and despite societal pressure, she decides to opt for artificial insemination. With her best friend, Wally, a neurotic and pessimistic man who has always secretly been in love with her, she embarks on this journey to motherhood.
The story takes an unexpected turn when, during an insemination party, Wally, in a fit of jealousy and confusion, swaps the chosen donor's sperm with his own. Years later, when Kassie becomes the mother of an adorable and bright child named Sebastian, Wally's life takes a complete turn. The comedic tension and drama begin when Wally becomes more involved in Kassie and her son's life, questioning what it truly means to be a father.
As the plot unfolds, it explores the complexities of friendship, unrequited love, and the madness of modern life. Will Wally manage to overcome his insecurities and get closer to Kassie, or will his secret become too heavy a burden? With humorous twists and emotional moments, the story delves into what it truly means to build a family in uncertain times.