I read Seven Days ... it is a nice one. I can suggest reading "Dog style" which is both an angst and romance yaoi with a sweet ending (one of my favorites) [don't get misled by the title, it is actually an interesting romance story]. "Cut" is another angst yaoi with a sweet romance which develops and ends nicely.
1) http://www.mangago.zone/read-manga/dog_style/
2) http://www.mangago.zone/read-manga/cut/
Angst ongoing classical yaoi with tragic ending
* http://www.mangago.zone/read-manga/kaze_to_ki_no_uta
[but this one might be hard to digest for some readers so be warned. It involves rape, incest, manipulation, pedophilia, attempts of suicide etc. so it is heavy and dark, it can't be labeled as a shotacon or a cute "unharmful" incest yaoi]
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Some other recommendations (I am still reading the sequel but the series has been quite heavy insofar):
1) http://www.mangago.zone/read-manga/zetsuai/ (Prequel)
2) http://www.mangago.zone/read-manga/bronze/ (Sequel)
This is still ongoing but you can find spoilers from readers comments on mangaupdates (it seems that it is going to have a good ending)
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I Haven't read this one yet but it is on my reading list as it seems to be a sweet romance story (most of the readers comments I've seen are favorable of it)
* http://www.mangago.zone/read-manga/kanashii_kotoba/
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This one is also one of my favorites. It involves angst because both the seme and uke had a difficult childhood and the seme's life is endangered because of his past and birthrights, but it is also a very good romance story. If you haven't read this yet, you really should (the end in my opinion is fabulous)
http://www.mangago.zone/read-manga/mede_shireru_yoru_no_junjou/
here`s a yaoi-list of antisocial boys falling in love:
http://www.mangago.zone/home/mangalist/15223/
Any recommendations about angst manga ?or about romance of antisocial boy? Or a sweet romance one shoot manga?or yaoi with a sweet romance like Seven Days? pls answer me T^T I really like that kind of manga