Karungali story is set on the backdrop of Chennai slums and here lives Ravi (kalanjiyam) who grows up selling drugs. One day, while escaping from the cops, he chances upon Dr Kanimozhi (sunitha) and he saves her from an accident.
She is impressed and decides to marry Ravi. However, Kanimozhi knows Ravi's past but is sure that she can change him. But Ravi has other plans.