A story about difficult choices, tough decisions, entwined lives and parents torn between their children and their hearts. Gulseren comes from a poor background, while Cihans wife Dilara is wealthy. They both gave birth in the same hospital on the same day 15 years ago but a mistake was made that would change their destinies. Having similar surnames, an absent-minded nurse mixed the babies and nobody noticed. As the truth about the children is revealed, fundamental problems arise between the two families because of their totally different lifestyles and economic statuses. However these events bring Cihan and Gulseren closer together. They have inexplicable feelings towards each other that they cannot run away from or ignore.

Masumiyet follows the story of Bahar, a married mother of two, whose life changes drastically after her 19-year-old daughter falls in love with a wrong man. Her daughter Ela's first love is not a college student her age, but her father's 35-year-old boss, who is about to marry someone else. Bahar, who is trying to save her daughter from this wrong relationship, can not prevent what will happen, no matter what she does. An event that occurs on the day of Ela's 19th birthday party, changes the lives of Bahar and that of her family forever!