The Dead and the Deadly (1982)

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