What will happen in Başka Bir Gün Season 1 Episode 1?

Nehir, who lives with her husband Serdar and two daughters, has her happy world turned upside down when Serdar suddenly disappears. While trying to find Serdar, she is forced to return to her law practice, which she has been taking a break from for a while. In the meantime, she meets Tuna. She is unaware that Tuna will later play a big role in her life. While Nehir is trying to stand up for her daughters who are devastated by the absence of their father, she is also struggling to find Serdar. However, what she discovers while searching for him makes her think that her marriage is not what she thought it was, and that she has never known her husband. Has Nehir been living a lie for years?