The series revolves around the life of Zeynep, portrayed by the talented Hande Doğandemir, a beautiful high school student leading a modest and ordinary life with her mother, Demet, played by Ebru Aykaç, in a small town. Zeynep has grown up without knowing her father, who was reported to be a sailor lost at sea. However, her thoughts are always consumed by the memory of her absent father.
When Demet faces financial difficulties, she decides to move to Istanbul with Zeynep, hoping for a fresh start. Their childhood friend, Jale, played by Deniz Türker, extends a helping hand as they arrive in Istanbul. Jale, the director of Sayer College, one of Istanbul's renowned private schools, assists Zeynep in enrolling. Despite the steep tuition fees, Zeynep is granted a scholarship to attend the prestigious institution.
Zeynep finds herself facing numerous challenges in her new life. As she tries to adapt to her new surroundings in Istanbul, she also has to navigate the shallow and privileged world of her wealthy classmates. Kerem, portrayed by the charismatic Kerem Bürsin, reigns as the school's king. No one, not even the teachers, dares to challenge him. Handsome and arrogant, Kerem becomes a relentless bully towards Zeynep, doing everything in his power to force her out of the school. Little does he know that Zeynep is a resilient and determined girl who never gives up easily. Meanwhile, Melis (Yağmur Tanrısevsin), who is infatuated with Kerem, goes to great lengths to please him, unaware of his true nature. On the other hand, Barış (İsmail Ege Şaşmaz), Kerem's close friend and a brotherly figure to him, disapproves of Kerem's behavior towards Zeynep. Consequently, Barış starts helping Zeynep and remains by her side, ultimately leading to a romantic relationship between them. The complex dynamics among Zeynep, Kerem, Melis, Barış, and their friends Can and Yagmür further intensify the storyline.
As the story unfolds, a shocking revelation emerges that Cihan (Emre Kınay), the school's sports teacher, is Zeynep's biological father. This long-buried secret not only changes Zeynep's life but also has a profound impact on Melis, who happens to be Cihan's daughter as well. Melis finds it difficult to share her father with another girl and struggles with the newfound truth.
Güneşi Beklerken explores the themes of friendship, family relationships, and the challenges of modern university life. Will Kerem's bullying persist, or will he undergo a transformation? Can two individuals from different worlds find love in each other? What happens when Zeynep discovers that her father is alive and standing right in front of her? Will Zeynep find happiness in her new life?