Year 1977, a September morning in Ankara... Yilmaz tries to rush his pregnant wife Neriman to the hospital and he crushes into Omer's car. This accident causes Omer's pregnant wife Inci, who was in the back seat, to have a pre-term labor. The babies are born on the same day. They see each other for the first time... This accident is the threshold of the coincidences that bring Ozgur and Deniz together. They come across each other in Ankara several times during their childhood and youth. Each intersection has a butterfly effect, resulting in drastic changes in their lives. They become each other's puppy love or their first heartbreak... But beyond this, each confluence changes their route of life. Not only theirs, but also their families'... They sometimes cause disasters, sometimes miracles. However, they can never be together. Whatever it is that brings them together, manages to build a transparent wall between them. Until they come across each other again in Istanbul, 25 years later...