The TV series "Kind Heart" is a melodrama about the fates of separated-at-birth twins. Young girl Kira doesn't get along with her father's new wife, so she lives with her teacher Taisiya Ivanovna. After the woman's death, Kira has no close relatives left, except for her beloved man Maxim, from whom she is expecting a child. However, Kira suffers a miscarriage, and the couple decides to adopt an abandoned baby from the maternity hospital. The newborn, Andrey, unexpectedly turns out to be Taisiya Ivanovna's biological grandson, and he has a twin brother.