http://www.taiseng.com/detail.cfm?varItemId=4400
(they mixed up covers for this movie and Final judgement starring Simon Yam)

added.

If nobody stops me in 15 days I will merge
Ng Gwok-Yan (1)
吳國仁(1)
Cantonese: Ng Gwok Yan
Mandarin: Wu2 Guo2 Ren2
Aliases: James Wu, Wu Kuo-Jen, Ng Kwok-Yan, Ng Kok-Yin

Cinematographer
The Shaolin Heroes (1980)
Eight Escorts (1980)
Miraculous Flower (1981)
Shanghai 13 (1984)
Fox Legend (1991)
Director
Ninja Hunter (1984)
The Super Ninja (1984)
The Death Games (1997)
Actor
Born Invincible (1978)
Planning
Ninja Kids (1982)

and

Wu Kuo-Ren
吳國仁
Cantonese: Ng Gwok Yan
Mandarin: Wu2 Guo2 Ren2
Aliases: Ng Kwok-Yan

Director
Ghostly Love (1991)
Heroic Brothers (1991)
Who's Killer (1992)
Final Judgement (1999)