The Dead and the Deadly(1982)

Overview:

Wah Li, known as Fat Boy to his friends, lives with his great-uncle the priest (Uncle). Together with his oddball friends Lai Li and Momo, Wah Li helps Uncle to run the local funeral services. When the body Ma Lun Chio is brought back to the village by a new wife and her "brother", Wai Li is suspicious. He sets out to find out how his friend died, but things are not what they seem.