Hmmm maybe at the end of the road?
you should try out stigma~
Not bl try lookism and how to fight
http://www.mangago.me/read-manga/yatamomo/
http://www.mangago.me/read-manga/hinadori_wa_shiokaze_ni_madoromu/
http://www.mangago.me/read-manga/rain_again/
http://www.mangago.me/read-manga/the_baker_on_the_first_floor/?BByS
http://www.mangago.me/read-manga/neon_sign_amber/
http://www.mangago.me/read-manga/therapy_game/
http://www.mangago.me/read-manga/blue_lust/
http://www.mangago.me/read-manga/konbini_kun/
yatamomo and niichan by HARADA
can someone recommend some manga or webtoon where the mc has a sad backstory or anything that is a sad story