Do you know any Yaoi-Manga, which is really sad but has a happy ending? Pleace help, thank...

mhhh dont know if its what you searching for...
http://www.mangago.zone/read-manga/castle_mango/
http://www.mangago.zone/read-manga/kowagaranai_de_soba_ni_ite/
http://www.mangago.zone/read-manga/koi_no_mannaka/

http://www.mangago.zone/read-manga/love_mode/
http://www.mangago.zone/read-manga/la_esperan_a/
http://www.mangago.zone/read-manga/end_game/
http://www.mangago.zone/read-manga/inu_to_tsubame/
http://www.mangago.zone/read-manga/bokutachi_futari_ga_koisuru_riyuu/
http://www.mangago.zone/read-manga/1001_nights/
http://www.mangago.zone/read-manga/nemureru_hana/

http://www.mangago.zone/home/mangalist/215/

http://www.mangago.zone/read-manga/mou_ichido_nando_demo/
This is a series. But the second one is kind of sad:
http://www.mangago.zone/read-manga/kimi_to_parade/
http://www.mangago.zone/read-manga/paradise_view/