Nakano Miharu 

historical/supernatural plot, kinda like game of thrones tbh (minus the weird incest shit)
https://www.mangago.zone/read-manga/stigmata_1/

historical action drama, also lotsss of political maneuvering
https://www.mangago.zone/read-manga/beauty_and_the_west_chamber/

hot cowboy bounty hunter x suspected fraudster
https://www.mangago.zone/read-manga/dead_or_alive/

this ones shounen ai but its so good trust, legitimately made me cry
https://www.mangago.zone/read-manga/murderer_llewellyn_s_enchanting_dinner_invitation/

mystery action drama. this ones also shounen ai but the plot & art are both insane, its my fav manhwa ever pls check it out if u havent already pookie
https://www.mangago.zone/read-manga/sangyang_the_wanderer/

its good but theres rape (not between mcs) that took me tf out cuz it came outta nowhere and was never fully dealt with
https://www.mangago.zone/read-manga/kill_me_if_you_can/

shit made me cry on more than one occasion, made me appreciate the joys of life no joke
https://www.mangago.zone/read-manga/bongchon_bride/

historical mystery drama, also rly good
https://www.mangago.zone/read-manga/hotel_pharus_mature/

its typical toxic yaoi noncon at the beginning but it gets so much better so fast
https://www.mangago.zone/read-manga/night_song_mgs/

modern supernatural, very sweet and wholesome
https://www.mangago.zone/read-manga/what_s_with_this_strange_dream/

enemies to lovers but make them firefighters
https://www.mangago.zone/read-manga/contradict/

about the established relationship of a gay couple whove been together for 10 years
https://www.mangago.zone/read-manga/the_most_ordinary_relationship/

hunterverse bl, pretty sad at certain points
https://www.mangago.zone/read-manga/death_delayed_for_a_short_time_because_of_the_will/

shits so cinematic it made me tear up ngl
https://www.mangago.zone/read-manga/reunion/

this ones also shounen ai but it legitimately made me sad its rly riveting
https://www.mangago.zone/read-manga/minority_1/

u mightve already read this cuz its popular but its pretty damn good, theres rape btwn mcs at the beginning tho
https://www.mangago.zone/read-manga/checkmate_1/

apocalypse action drama, theres also rape btwn the mcs at the beginning tho
https://www.mangago.zone/read-manga/radio_storm/

Wow wow thank youuuuu!! This is such a treat ლ(´ڡ`ლ)

Single Parent:
Our Sunny Days
Tabun Korekara Ai no Hibi
Papa to Boku to Kazoku ni Natte yo
Sorenari ni Shinken nandesu

Yakuza:
Long Time Red Mall
Don't mess with the puppy
Monsters in Love
Saezuru Tori wa Habatakanai

Vampires:
Vassalord
Kyuuketsuki to Yukai na Nakama-tachi
Smoky Nectar (and its continuation)
Blood Bank

Regressions:
The Fallen Duke & the Knight Who Hated Him (Yaoi)

Office Romance:
I am here to take my revenge
Eigyou Nika!

Games:
The Guildmate next door
Netkama Punch

Reincarnation done right:
The Fairy Bath Thief

Police:
Hinto Yajuu (Pervy Yakuza and police officer)
Stigmata (it's a series and its really good)

My favorites (some are already mentioned, so I won't do it twice):

The Third Ending (reunion, friends to lovers, heartbreak)

Payback (the psychology is good, revenge story against someone else with ML help, HE)

Life Senjou no Bokura (HA, I do t want to spoil it too much)

Rutta To Kodama (High school, but hear me out, it's a good growing up story)

Define the relationship (really good Omegaverse story)

Ang Ang (BDSM done really well. It surprised me and a good storyline)

Ichi Ni no San (Cute Highschool unrequited love story)

Heart Stain (it's more realistic towards high school and unrequited relationship)

KWAK SUHWAN IN THE "rainbow city" NOVEL I TELL YOU THIS MAN WOULD RATHER HAVE THE WORLD SUFFER ANOTHER ZOMBIE APOCOLYPSE THAN HAVE HIS BB HAMSTER DIE AHHHHHHHHHH. ヽ(`Д´)ﾉ
PPL IN THE MANHWA COMMENT SECTION KEEP SAYING "oh major is loyal to rainbow city" "major is gonna betray dr.seok" and I say NO BITCH MAJOR KWAK IS AND WILL ALWAYS BE LOYAL TO DR.SEOK AND ONLY DR.SEOK ヽ(`Д´)ﾉ

Major Kwak is only doing his best to protect his pretty lil hamster wife Dr. Seok .

Im trying so hard not to spoil BECAUSE THE THINGS HE DOES IN THE NOVEL UGHHHHHHH. PPL WHO DONT LIKE MAJOR KWAK MAKE ME WANNA GO FERAL ヽ(`Д´)ﾉ. BRO IS THE GREENEST FLAG AND IS LITERALLY SO SO SO SOFT TOWARDS DR.SEOK. (╯°Д °)╯╧╧ IM SO FRUSTRATED PEOPLE CANT SEE THIS UGHHHHHHHH. Everyone who hates Major kwak is the little mushroom equivalent of the protesters against lu feng IMM TELLING YOU THEY THE SAME THING. ONLY DR.SEOK KNOWS HOW MUCH HE LOVES HIM AND ITS ENOUGH FOR MAJOR KWAK BUT SOME PPL BE HATING HIM BECAUSE THEY GOT PEANUT FOR BRAINCELLS AND IT PISSES ME OFF SO BAD (╬￣皿￣)

Yes,I agreed with you. Major Kwak is one of the greenest flag ml(≧∀≦). He always consider Dr, Seok's safety first. Readers are still doubting him, especially the latest chapter when he said : " the last thing I want is to crush him with my own hands". Please, let's trust the process. I don't believe he will hurt his wife ┗( T﹏T )┛