Zuhal Erdem, a personal development expert at the peak of her career, looks like a modern urban woman, but she is a completely different person in her home with her three sisters and father. Unable to go outside the order and rules established by her father Çetin because of the oath she took, Zuhal once again faces her loneliness while watching her sister Aslı's wedding preparations. Meanwhile, she is unaware that the person who crosses her path by chance will change her life. Zuhal, whose fate constantly intersects with Tayfun, tries to resist her feelings. While Tayfun tries to understand Zuhal's resistance, an unexpected tragedy will reveal the truth behind Zuhal's vow to her father.