In the prelude of the movie, PhD microbiologist Professor Chua See Kiat was hanging out on a rooftop when a cab-driver named Ah Tau mistaken him for him attempting suicide. This made Ah Tau to receive a fine for illegal parking.

After continuous attempts on finding a new job, Professor Chua See Kiat had no choice but to resort into cab driving. Ah Tau volunteered to help him and became his first passenger. Soon, Ah Tau was then fined again for another illegal parking.