https://www.mangago.zone/read-manga/gokushufudou_the_way_of_the_house_husband/
Haven't read gokusen but this might be what you are looking for
i havent read it but ill give some reccs based off the synopsis since you seem good with a broad area (⌒▽⌒) btw will be almost all bl since thats what i mostly read, will clarify if its yaoi tho
merry marbling - soft and fluffy comedy bl, ongoing
when the killer falls in love - comedy bl, ongoing
robber x lover - adorable comedy bl, complete, same author as merry marbling so if you like one youll prob like the other
park hanhoo's manager - bit of a drama/thriller bl, ml is mafia if im remembering correct, complete
mad dog- thriller bl, mc and ml are connected to mafia or smthn similar, might be getting 18+ sides in the future fyi, complete
kisses x kiss x kisses - comedy bl set at a highschool, complete
heesu in class 2 - one of my personal favorites, soft comedy bl, extras have more r15+ content but i dont think its enough to call it yaoi, complete
fools - my all-time favorite by far, slice of life bl with drama aspects, some suggestive scenes but nothing explicit, towards the end the names are changed to western ones so if thatll annoy you tappytoon is releasing it too, complete (ongoing release for tappy)
i'm so empty rn, i just binged gokusen and now i feel the void. Please suggest anything like ''gokusen'' anything wholesome! comedy aspect! setting aspect! yakuza story! love story-wise! anything that slightly resemble it, I'll take it! (i wouldddddddd love if the ML is like Shin) thanks!!!!