Choe Dong-Joon is listed as second director in the hkmdb:

http://hkmdb.com/db/movies/view.mhtml?i ... ay_set=eng

He is listed in Korean sources, but I doubt that he directed the movie together with Sammo Hung. I imagine Hung wouldn't be pleased to read another director

I delete his name if no one objects.

Removed Choe Dong-Joon.