The Mad Killer (1971)
Original title: 瘋狂殺手
The Mad Killer is a 1971 Chinese-language action movie directed by Lo Chen and Ng See-Yuen, with a running time of 1h 38m. It stars Kao Yuen, Susanna Au-Yeung Pui-San and Stanley Fung Shui-Fan.
A lovelorn pompous knight lashes out after losing a friendly bout with a rival classmate who's also betrothed to the teacher's daughter. Enraged, the estranged knight threatens his own clan who withholds a closely guarded family secret.