The Girl I Met : When Karma is back with a Vengeance

The story revolves around a boy who falls in love with a girl during his undergraduate career. The girl at first develops no emotion for him but gradually as the years passes the girl finally proposes her. Everything goes on in a lovey-dovey way and later both of them get close enough. One day the boy realizes her past mistake he did to a girl and then to her surprise he finds out that it is the same girl he attempted to kill once. Now the girl is back with her vengeance. When karma is back with a vengeance. What will happen now? Will the boy take over again? And who is actually that girl he met...