Diyar-e-Dil depicted the story of Bakhtiyar Khan / Agha Jan (Abid Ali)'s family, It is the story of two brothers (Agha Jan's sons) and their emotional bond, the story depicts their journey of how they separate from each other and suffer without each other's presence. Agha Jan's family which apart long ago due to the rebelliousness of his son Behroze Bakhtiyar Khan (Mekal Zulfiqar) when he refused to marry his father's choice (and his paternal cousin) Arjumand Bedar Khan (Hareem Farooq) to marry Ruhina Arsalan (Sanam Saeed) instead. After getting disowned by his father, Behroze left his house to marry Ruhina, without the consent of Agha Jaan, while Arjumand was forced to marry Behroze's younger brother, Suhaib Bakhtiyar Khan (Ali Rehman Khan). Behroze and Ruhi were insulted by Agha Jan when Behroze came back for apology, Agha Jan chose Suhaib and Arjumand over them, the two were banished forever, they left and decided to start a new life in Lahore whereas Arjumand and Suhaib decided not to grow more close. Both the couples faced different situations, with one in love and the other in depression. The series then focused on their life after marriage and showed how Suhaib and Arjumand grew more closer after giving birth to Wali Suhaib Khan (Osman Khalid Butt), and fell in love, whereas afterwards Ruhi and Behroze's daughter, Faarah Behroze Khan (Maya Ali) was born as well. After twenty-years, Behroze became a successful business man, both the couples were settled and satisfied. It was also shown how Suhaib never stopped looking after his older brother, in hope to get him back home until his death after which Behroze reunited with his family. Their children were married, fulfilling Suhaib last wish to reunite the family. However, Ruhina opposed this decision and left Behroze in anger due to her brother's manipulation As a result, Behroze died of her umbrage. With the grief of her father's death, and the constant persuasion of her maternal uncle and cousin, Faraah demanded for a divorce from Wali along with her inheritance, which further increased tension in the family and became the cause of Agha Jaan's developing illness. Faarah told her mother she did not want her inheritance, and that it was added to her divorce agreements without her choice, due to which Ruhi left the house in anger and her daughter alone. After Agha Jaan's second heart attack, Wali kidnapped Faarah from her house and drove her to his summer resort, locking her in a room so she would not be able to escape. Once Faarah calmed down, Wali made an agreement with her; that if she agreed to live with Agha Jaan for three months, he would give her a divorce so she could marry her cousin Moeez (Ahmad Zeb) whom which he thought she loved. Following the agreement Faarah developed affection towards Agha Jaan when she realizes the mistakes and lies told by her uncle Tajamul Arsalan (Behroze Sabzwari) and mother, and eventually develops a soft corner for Wali. Tajamul and Moeez's truth was revealed to Ruhi after which she regretted her doings and was locked up by Moeez. He kidnapped Faarah to retain her inheritance to invest in his business, where Wali saved Faarah and gets wounded of gun shot. Moeez ended up in jail, while Ruhi breaks all ties from her brother and reunites with Agha Jaan and her in-laws apologizing for her doings. Faarah admits her love for Wali the day her contract was due, and the two reconciled removing all the misconceptions they had in their hearts and complete the valley of heart (Diyar-e-Dil).