Bihter Yöreoğlu blames her mother Firdevs for her father's death because her father had a heart attack when he found out that his wife was cheating on him. Firdevs Hanım wants to marry the rich businessman Adnan Ziyagil in order to find financial relief. Bihter, despite knowing her mother's interest in her, gets close to Adnan and makes him fall in love with her. Adnan and Bihter get married. Adnan's nephew Behlül also lives in his house. Adnan's daughter Nihal is an introverted young woman and has been in love with Behlül for years, but Behlül sees him as her sister. Bihter and Behlül fall in love with each other over time, but at first they don't accept it and try to stay away from each other. Behlül gets engaged to his girlfriend Elif for this, but this doesn't work. Firdevs Hanım is the first person to notice their relationship and tries to direct Behlül's attention to Nihal in order to protect her daughter's marriage.

Bihter and Behlül's love is now moving forward like a truck with broken brakes. Behlül, who is terrified of things going wrong and losing his uncle's financial and moral support for him, uses Nihal's interest in him to get away from Bihter and gets close to Nihal, proposing to her. These events cause Bihter's mood to deteriorate and she becomes ambitious to get Behlül back. There is another witness to this forbidden love: Beşir, who has been in love with Nihal for years and can never handle her being upset... Beşir is ready to do anything to keep Nihal from being upset; this includes telling everything he knows to Adnan Bey...