Mr. Vampire

Master Kau is a Taoist priest who performs magic that maintains control over spirits and irrepressible vampires. Together with his inept students, Man Choi and Chau Sang, he resides in a large house protected from the spiritual world with talismans and amulets.
One day, he accepts an assignment from a wealthy businessman, Yam, to remove Yam's deceased father's grave and rebury it, with the hopes that doing so will bring more prosperity to the Yam family. Unfortunately, upon opening the coffin, Kau notices the body is still intact, even though it's been years since he died.
Realizing that it is a vampire, Kau orders it to be moved to his house for further study and to be subject to spells that will prevent it from awakening. Kau deduces that Yam's father had died angry, and his last breath became stuck in his body for years, causing it to keep him "alive" and reducing it to a mindless state...