Fong Kwok-wah is a Chinese guerrilla fighter from the time of the Second Sino-Japanese War. In 1938, he was fighting with Yamamoto Kazuo, a major of the Imperial Japanese Army, when they were interrupted by Cheung San, the progenitor of all vampires. The two men and a boy named Fuk-sang were bitten by Cheung San and they become vampires.  In present-day 1998, Fong lives in Hong Kong under a new name, Fong Tin-yau. His physical appearance has not changed since 60 years ago. He works as a policeman while Fuk-sang lives with him, attends primary school, and pretends to be his son. Fong meets Ma Siu-ling, the heiress to a clan of ghostbusters who have dedicated themselves to ridding the world of evil supernatural beings. Fong gradually becomes embroiled in a love triangle with Ma and Wong Jan-jan, Ma's close friend and confidante.  On the other hand, Yamamoto has become the influential boss of a big company, and he commands a small group of vampire followers. Planning to turn every human being into a vampire, Yamamoto unleashes his minions to attack people and spread the "vampire gene". Chaos break out in Hong Kong as vampires multiply and roam the streets freely. At this point, Fong teams up with Ma and his friends to stop Yamamoto and destroy him.  However, even after Yamamoto dies, not long later, a magician called Yu-meng Sap-sam resurrects him and controls him to do his bidding. The magician is actually Lo Hau, an evil sorcerer from ancient times who wants to dominate the universe. Once again, Fong, Ma and their allies combine forces to confront Lo Hau and put an end to his wicked ambitions.