Kajal Sharma is the daughter of Professor Sidhant Sharma. On the other end of the spectrum, Karan is a criminal working for Gajraj Chaudhry. The film starts with Gajraj ordering Karan to kill a journalist for writing negative things about him, which Karan dutifully does - by chasing him outside and catches him inside a marketplace full of people (including Kajal and her father). Kajal's father reports the crime. Karan finds out and breaks into Kajal and Sidhant's home - presumably to kill Sidhant - and starts beating him up. In a desperate attempt to get him to stop, Kajal slaps Karan. They make eye contact, visibly entrancing him, and he leaves their home.
Karan goes to Tulsi, a courtesan who is in love with Karan. There, it is shown that he is unable to forget Kajal, or more specifically, her eyes. Karan starts stalking Kajal, and she starts getting creeped out. One day, as Kajal is leaving the temple, he corners her. Kajal feels disgraced and lashes out at him, criticizing his behavior, and saying that he feels simply lust for her. Karan feels disgusted by this and leaves.
Karan is shown to have a soft side when he saves a child - named Timepass - from being mistreated by customers at a bar. Being reminded of himself (in a flashback it is revealed Karan was an orphan and was forced into becoming a criminal), Karan decides to take the kid in, introducing himself to Timepass' friends and one of said friends give him food to eat.
The next time we see Kajal, she and some other women are travelling by a Bus (including Karan and Timepass). They get harassed, and Karan gets off from the seat to save them in the nick of time. Kajal, after seeing his courage and helpful nature, starts to fall for Karan. She befriends Timepass, from whom she gets to know more about Karan. She approaches him with the help of Timepass, and starts to meet him regularly. She realizes that he's had a tough life and had gone down the wrong path. With encouragement from Kajal, Karan leaves his criminal lifestyle behind to be with Kajal. When he tells Tulsi about him and Kajal, she is heartbroken but decides to remain his friend.