Karthi (Shiva), an engineering graduate with an attitude, is on the look out for a job. He does not seem to be much serious in seeking employment while his friends try their best to settle him. He spots Tamannah (Charu) in a bus stop and it is love at first sight. He finds her on a couple of occasions later and in fact misses an interview in her pursuit. Destiny seems to have something good waiting for him and he gets to spend the most beautiful phase of his life, giving her a ride in the car while waiting to pick the owner of the car at the railway station. Life takes an exciting turn from this point for Karthi who accepts to drop her in Mumbai and thus begins Paiyaa's journey of romance, action and emotions on a highway with a few turns, some with caution and some without.