I dont read rly sad bls so the saddest for me (which is yaoi) was Epitaph (Perfume). I loved that one and the ending just hit different for me than any other "sad" bls that I read (〜 ̄△ ̄)〜
Killing stalking. It's hit on different level. Like how Both of them being thrown out from the mankind. Yoonbum being molested since young, Sangwoo growing up seeing how horrible his mother was. They both just wishing some love for themselves sadly it's doesn't work for both of them.
what are your saddest Bl