Do you guys have angst yaoi manga recommendations like caste heaven

try timeless melody hun

Hmm i didn't read caste heaven so idk if it's what you're looking for but i'll recommend some angsty ones with interesting stories: (tw beware)
A painter behind the curtain
Into the rose garden (not for weak hearts)
Prison Breakfast
Broken Boy
Love sick dog
OUROBOROS
Sharpe and rabbit

Lemme know if these are too much i could maybe suggest less hardcore ones without r*pe or smth

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

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

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

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