yakuza, gangs

https://www.mangago.me/read-manga/raise_wa_tanin_ga_ii/

https://www.mangago.me/read-manga/gokusen/

https://www.mangago.me/read-manga/the_children_s_teacher_mr_kwon/

https://www.mangago.me/read-manga/down_and_dirty/

Gang gang jkjk heres some yakuza ones
https://www.mangago.me/read-manga/eunsuk_jung_gu/
https://www.mangago.me/read-manga/daddy_tastes_like_butter/
https://www.mangago.me/read-manga/isekai_yakuza_mofumofu_no_taizaiki/
https://www.mangago.me/read-manga/mangaka_to_yakuza/
https://www.mangago.me/read-manga/gokushufudou_the_way_of_the_house_husband/ (This actually has a anime and it's on netflix)
https://www.mangago.me/read-manga/this_yakuza_is_no_gentleman/
https://www.mangago.me/read-manga/yakuza_yuri/
Idk ya can look at the tag Yakuza for more cuz ion know many
https://www.mangago.me/tag/Yakuza/

thanks !