Lots of characters to ID here:

http://www.hkmdb.com/db/movies/images.mhtml?id=8361&display_set=eng

Here are the major characters that need IDing:

1. very prominent character - play's Bee's right-hand man


2. One of the bosses playing mahjong


3. Another prominent character - Piggy, Kwan's teen thug


4. Piggy's best friend


5. Triad boss at final sit-down


6. Triad boss at final sit-down


7. Triad boss at final sit-down


8 . Triad boss at final sit-down


9. School principal


10 . Benjamin Yuen's girlfriend