Johnny Cheung Wa in Martial club...

[Teddy Wong]

is credited twice:

Johnny Cheung Wa ... student
Ho Kei-Cheong ... extra
Tony Tam Jan-Dung ... extra
Mak Wai-Cheung ... extra
Mak Fei-Hung ... extra
Yeung Wah ... extra
Jackson Ng Yuk-Sue ... extra
Siu Tak-Foo ... extra
Chow Gam-Kong ... extra
Siu Yuk-Lung (1) ... extra
Ting Tung ... extra
Johnny Cheung Wa ... extra

http://hkmdb.com/db/movies/view.mhtml?id=6271&display_set=eng

[Gaijin84]

Corrected - thanks!