kinda controversial, but Into the Rose Garden
on a second thought, i feel like this is a bad reco-- it's toxic af and quite brutal after all.
try No Home, Lucky Letter (has a bit too much smut imo though), or 10 Years I Loved You The Most. If you're alright with mangas, try Dear Gene or Smells Like Green Spirit ^^
https://www.mangago.zone/read-manga/heart_of_thomas/
https://www.mangago.zone/read-manga/zankoku_na_kami_ga_shihai_suru/
https://www.mangago.zone/read-
manga/kaze_to_ki_no_uta/
https://www.mangago.zone/read-manga/tomoi/
https://www.mangago.zone/read-manga/california_monogatari/
https://www.mangago.zone/read-manga/golden_days/
https://www.mangago.zone/read-manga/new_york_new_york/
https://www.mangago.zone/read-manga/marginal/
https://www.mangago.zone/read-manga/madman/
"Glory Days"(华年) in bat0 (my personal fav)
"Novae" by Kaiju in webtoon
"Nile wo Sakanobotte" in MRM
I didn't write the link in the correct way, anyway here you go, one of the best retro Manga I ever read
https://www.mangago.zone/read-manga/kaze_to_ki_no_uta/
For Danmei :
(The blind concubine) This was the most painful story I have ever read, I even vowed to never read it again in my life.
https://www.mangago.zone/read-manga/timeless_melody/
I want to punish myself. pls give me the most gut wretching and heartbreaking manhwa you've read. I don't want to tear up. I want to SOB.