Sifir Bir tells the story of Savaş, Cihat and Azad who left their criminal lives in Adana and settled in İzmir. Adana gang leader Savaş, together with Cihat and Azad, decide to leave their violent past behind them. The three friends leave Adana, open a car wash and settle in Izmir to start a new life. However, when a little girl named Melek takes shelter with Savaş and his friends after all the bad things that have happened to her, the team takes action. They decided to chase after the men who hurt Melek and find themselves on a path of no return.

After being released from prison, where they had been incarcerated for many years, Fırat Doğulu and his companion Akın find themselves embroiled in a relentless quest for revenge.