'You're so easy to love' reads a wall hanging in the apartment of Bala and Priya, the leads of Zero. It is a killer in-joke in a film that deals with the trauma that follows for these two characters who do not have any idea of what is about to happen because of their romance. He is a social worker with a successful lawyer for a father. She is an orphan. They have married against the wishes of his father, who has a valid reason for his reservations about this match. Priya's long-dead mother, Devi had become mentally unstable during her pregnancy to such an extent that even her husband had to lea...