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Thora Sa Haq tells the story of three individuals; Zamin, Seher and Hareem. Zamin and Hareem love each other, but fate has some other things in store as Zamin gets married to Seher, and they are forced to hide their nikkah due to circumstances. Ayeza Khan as Seher is a beautiful and simple girl who lives alone with her father, Aijaz in Hyderabad. Mehmood Akhter as Aijaz is her father. His only wish is to see her married due to his deteriorating health. He is the youngest of three brothers. Imran Abbas as Zamin is a good looking and charming guy. He is the son of the second brother Waqar, and the first cousin of Seher. Mashal Khan as Hareem is the only daughter of Iftikhar, the eldest of the three brothers, and the cousin of both Seher and Zamin. She has a sweet and understanding nature. Hareem is in love with Zamin, and her only wish is to get married to him. Saba Faisal as Rabia and Firdous Jamal as Iftikhar are the parents of Hareem. Rabia has a dominating nature. She has a grudge against Tariq and forced the entire family to break all relations with him. Behroz Sabzwari as Waqar is the father of Zamin. He secretly keeps in contact with his younger brother, Tariq while the rest of the family has cut him off.