"Set Me Free" is a love triangle set in the 1950s during the Pahlavi era in Iran. The series revolves around two brothers from a prominent family in Siahrood. Hatam, the elder son of the family, falls in love with his son's nurse, Maral. While ambiguities surround the fate of Hatam's former wife among the people of Siahrood, Maral discovers that the life of his brother Younes is in danger. As Hatam helps Maral, he realizes that his brother's story is intertwined with his younger brother, Hatef, who migrated to Tehran several years ago.