The paths of city businesswoman Haziran and Poyraz, a handsome and helpful young man, intersect on Swallow Island, and love arises from the disagreements of these two opposite characters.

Lillie, a determined American woman, ventures overseas to join Dr. Jude at a remote medical mission in the Ottoman Empire (now Turkey). However, Lillie soon finds herself at odds with Jude and the mission’s founder, Woodruff, when she falls for the titular military man, Ismail, just as the war is about to erupt.

There is a change when three friends living in the neighborhood continue their ordinary lives. The emergence of a mysterious stranger who has just moved to the neighborhood has also changed the life of the third.

In the story that begins in a suburb of Istanbul, the events between Kenan Cesur, who shouldered the burden of a momentary mistake, and Zeynep proceed with an adventure full of ambition, passion and regret. Imam Yusuf and Teacher Nilüfer, on the other hand, become a beacon of hope for the young people whose dreams are gradually disappearing in the dark road they enter by saying “Nothing can happen for once”.

Gönülçelen is inspired by Bernard Shaw's play 'Pygmalion' and its film adaptation 'My Fair Lady'. The series transports the scene to Istanbul where both Murat and Hasret, the two main characters, live. Murat is thirty years old and a successful musician and music educator who was born and raised in Istanbul. He comes from a long line of respected, rich and noble people. The female protagonist Hasret - on the other hand - was born and raised in one of Istanbul's most impoverished neighborhoods. She is a free spirited young woman with a 'foul' mouth. Hasret makes her living by selling flowers and occasionally singing in a band. Murat hears potential in her untrained voice and takes it upon himself to teach her the secrets of music by giving her a classical training.