Any angst filled bl where the character is morally gray (may or may not be toxic ) .
Itou-san (Kuraka Sui) is about an assassin . It's bleak and black, but I love it. https://www.mangago.me/read-manga/itou_san_kuraka_sui/
can anyone recommend me black flag seme ?
https://www.mangago.me/read-manga/hwang_young_s_misery/
https://www.mangago.me/read-manga/open_board_dreamyzz/
https://www.mangago.me/read-manga/palace_of_bardo/
https://www.mangago.me/read-manga/vivarium/
https://www.mangago.me/read-manga/dear_teddy_bear/
https://www.mangago.me/read-manga/beware_of_the_full_moon_in_march/
This one's a black flag but he identifies as green. You'll see what I mean haha
https://www.mangago.me/read-manga/mary_jane/
https://www.mangago.me/read-manga/a_tree_without_roots/
https://www.mangago.me/read-manga/passion_1/
https://www.mangago.me/read-manga/love_history_caused_by_willful_negligence/
can someone recommend me some angst bl like the uke should be a red flag or something? (Red flag means a red carpet, he realise latter on )
also happy ending
(i need therapy )
https://www.mangago.me/read-manga/counter_offensive/
No other bl can match your description more than this one , good luck bestie
Honestly all semes are trash rn jinx is holding the crown , but these too were a difficult read too:
https://www.mangago.me/read-manga/profundis/
https://www.mangago.me/read-manga/stigma_2/

Can anyone suggest me a arrange marriage bl book which has angst ?
I am already reading beyond memories .
arrange marriage is kinda rare in bl, I have one but it's not very angsty but still an ararnge marriage https://www.mangago.me/read-manga/muri_marriage/
Thank you :)
Welcome hope u like it ≧∇≦