Ek Haseena Thi Ek Deewana Tha tells the story of two young lovers, Sunder (Salman Khan) and Aarti (Sridevi), who meet and fall in love. However, their relationship is put to the test when Aarti's family disapproves of Sunder, leading to a series of misunderstandings and challenges. The film explores themes of love, family, and loyalty, making it a relatable and engaging watch.