The full name is "Weasley's overlord"
Starring Qin Pei, Hu Huizhong, Xu Xiaoming and Yuan Kui.
The story takes place in Garinan, a fictional Southeast Asian country, and some scenes are quite large, which is rare in Hong Kong movies.
What the landlord wants to say is that the mother of the former president was buried in that grave, and General Ruan used it to destroy the feng shui of the former president in order to succeed in usurping power.