I want some recommendations on good drama regarding Yakuza and crime related stories. If you know of any good recommendations please let me know, movies are included as well but dramas are preferred, thanks! ;)
My boss,my hero 
shiritsu bakalaya koukou 
Dragon zakura 
Gokusen 
Thanks but I've watched them all except for Shiritsu Bakalaya Koukou, also I'm looking for something more serious, I like comedy but I'm meaning something like Ninkyo Helper or Gokuako Ganbo type of drama. Thanks though ;)
Double Face - Sennyuu Sosa Hen and Double Face - Gisou Keisatsu-hen

Are you only looking for jdrama? if not there are some good serious korean gangster drama and movies.

Last
Cruel City (the synopsis is a bit misleading, the whole girl-seeking-revenge is a mere subplot)
and I've hear good things about Friend, Our Legend

some more melodramatic are:
Swallow the Sun
Time Between Dog and Wolf
East of Eden
Giant

Movies:
New World
(one of the sleekest gangland films i've seen to date)
Gangster High

not personal favorites but maybe you will like them
A Bittersweet Life
For the Emperor
(basically gangland noir)

While I prefer Jdramas I'm open for anything as long as it's good, thanks for the recommendations sis! ;)
a tv movie
double face (remake of infernal affairs)
My Boss My Hero
Gokusen
Sailor Fuku to Kikanjoo
Time between Dog and Wolf
@sakuraKhey already on my watchlist :p but thanks

@irish and Christine, thanks a bunch for the rec ;) My Boss My hero was my first drama ever hehe
I still haven't been able to find the second double face movie 
You mean you completely didn't find it or you found it RAW without subs?
@irish you can find the raw and the subs separately.
@Neyjour, thanks and sorry for the huge delay! ;)

Lovers - Korean gangster drama
Le Jun Kai - (short) Chinese gangster drama
Cheap Love - not necessarily Yakuza related, but deals with the underworld of scam artists & sleazy recruiters (guys who recruit girls to work in porno movies).