Pyaar To Hona Hi Tha is a story about a girl (Kajol) who comes to India from Paris to win back her fiance who has fallen in love with another rich girl. On her flight from Paris she meets Ajay Devgan who is a thief and hides his loot in Kajol's bag and then what follows is a long chase. By the time he gets the necklace, he gets close to Kajol and promises her to help her to win back her fiance. In doing so, both fall in love with each other.