The Ukrainian melodramatic series "Defenseless Heart" tells the story of Slava and Lyuba, a couple deeply in love who are planning to get married. However, Slava's mother, unhappy with the future bride, manipulates the situation to make them fight and "introduces" another girl to her son, someone she herself likes. Slava and the shy and timid Tanya submit their marriage application to the registry office. But just in time, Slava discovers his mother's schemes and reconciles with Lyuba, leading her to the altar instead of Tanya. Meanwhile, the abandoned bride learns that she is expecting a child.