Dark Heaven
It has so much angst but it ends with happy ending.
This one is not super angsty or anything but in the middle i was like whyyyy aughh but it's all ends well :D http://www.mangago.zone/read-manga/koi_to_wa_yobenai/
The first story in this one hurt MY feelings when they were hurt but very sweet happy ending! http://www.mangago.zone/read-manga/doushitemo_furetakunai/
Wait this one, pain and then more pain and then pain and a happy ending http://www.mangago.zone/read-manga/warehouse/
Any frustrating bl story that has many hurt point and turns out got a HE?
Wanna hurt myself but not to hard TuT
If there's really none feel free to list out some awesome tragedy manhwas.
Me first:10years where I loved you the most TT