Cgh

Read this one! : https://www.netcomics.com/comic/intense
It reminds me of Saezuru a lot. it's sold on google play too.
(-- = tragic end)
Yakuza:
http://www.mangago.zone/read-manga/kobi_no_kyoujin/ (intense)
http://www.mangago.zone/read-manga/unknown_letters/ (intense)
http://www.mangago.zone/read-manga/gives/ (bittersweet)
http://www.mangago.zone/read-manga/silence_akiyama_koito/mf/v01/c007/2/ (ch. 7-10)
http://www.mangago.zone/read-manga/shisei_no_otoko/ --
http://www.mangago.zone/read-manga/never_let_go/ (secretly yearning)
http://www.mangago.zone/read-manga/anohito_to_nitenai_kuchibiru/mf/v01/c006/ (ch.6 uke is badass)
http://www.mangago.zone/read-manga/yokosu_inu_mekuru_yoru/ (dark)
http://www.mangago.zone/read-manga/kimi_ni_ageru/ (lonely ex-yakuza. slow build-up)

intense bittersweet love, with hearthache:
http://www.mangago.zone/read-manga/complex_manda_ringo/ --
this is my favourite: http://www.mangago.zone/read-manga/500_nen_no_itonami/ (and "End Game")
this is a favourite too: http://www.mangago.zone/read-manga/itou_san_kuraka_sui/
http://www.mangago.zone/read-manga/ouji_no_hakoniwa/ and "red theatre"
http://www.mangago.zone/read-manga/the_inheritance_of_aroma/ --
Suimanka, Nii-chan, Yatamomo, Yoru to Asa no Uta...
http://www.mangago.zone/read-manga/my_god/ (first story)

Other:
ten count of course
http://www.mangago.zone/read-manga/akunin_o_nakaseru_houhou/ (seme x uke interaction made me wanna write it somehow)
http://www.mangago.zone/read-manga/double_hound/ (uke is an assassin and wants to have sex)
the flower theft (sexual tension gets high sometimes)

thank u for this list ;A;

The first one looks cool, really tragic end? Please before I buy something and regret it ╥﹏╥

Acid Town
Canis
Yondaime Oyamoto Tatsuyuki + Jealousy (prequel-side story)
Given
(the first two are very very alike psychological,yakuza,dark past,victims)

Sorry i meant Gives not given (but given manga is great too <3)

It's not a tragic end, it's an happy end. :) But the story overall is bittersweet and dark. The two MCs carry a hidden sadness in their hearts due to their tragic pasts. They're broken ppl who save one another like in Saezuru. There isn't much dialogue but I like it this way. You can feel the sexual tension and yearning in their gaze and words carry more weight when spoken.
A sad part of the story is similar to Yondaime Ooyamato Tatsuyuki in a way but they overcome it. I don't wanna spoil it any more than this.

As long as the ending is a happy one, I'd go for it. Thank you :)

Thank you everyone~~

I will your recommendations づ￣ ³￣)づ

Wow thank you so much for the list !! (≧∀≦)

thank you!! I will check out (=・ω・=)