This story takes place in Hong Kong during the 1960s. KO TAI-HEI (Lai Yiu Cheung), an illegal immigrant who is kind-hearted by nature, gains recognition from his father's good friend LOUIS KIM (Joe Junior), who helps him join the Police Force. By accident, he gets shot in the head, and the bullet fragments stimulate his brain cells, accelerating his brain evolution to the highest IQ level.