I want to delete in a few days if nobody objects Stephen Tung Wai from the hkmdb cast list of "Magic Story". He is not in the movie and not in the HKFA cast list.

I guess Tung Wai landed on the hkmdb cast list because his chinese characters are similiar to the characters of Bill Tung.
The actor who plays Akui (that is Tung Wai's role name at the hkmdb cast list) is not Tung Wai. See image of that unknown actor:

http://hkmdb.com/db/movies/image_detail ... ay_set=eng

Deleted Tung Wai's name from the cast list.