T.T. :D. https://www.asianfanfics.com/story/view/1165439/the-boxer-a-yixing-series-angst-romance-suspense-lay-yixing-exolay

Thanks. I will read all of theM~

Ah crap I forgot about the enter key again.

not crying on a Sunday: It's really good and it's an idol x idol fanfic. It's in a high school AU and the only thing I suggest you watch out for is grammar mistakes. Other than that, it's a really good story that deals with homophobia and I honestly love it so much. <3
http://archiveofourown.org/works/4639377

http://archiveofourown.org/works/4639377

I'm working on a sad, psychological drama one featuring Park Jimin/Jung Hoseok: http://www.asianfanfics.com/story/view/1218420/hold-me-tight-angst-mystery-psychological-romance-jimin-bts-jihope
Feel free to try it out if you'd like! Thanks!

I just started posting a fluffy and angsty Oh Sehun/OC. I'd loved it if you checked it out! :)

Well, the cruelest (I'm serious about that one, it is cruel) and most heart-breaking story I remember at the moment had like almost 400k words and it was also very gay... not sure if that's something for you, but I'll leave you the link anyway.
http://archiveofourown.org/works/5293532/chapters/12219563

https://www.asianfanfics.com/story/view/1091980/pretty-boy-i-m-nobody-angst-bromance-anorexia-chen-xiuchen-eatingdisorder-tenderrose

http://quiescentme.livejournal.com/2557.html

None of these are oc-fics but they're more or less member-centric, so it's not even gay. Both are triggerwarned for eating disorders but yeah, they're great. Truly, really great.

This fic killed me tbh. It's called Hardships and a Photobook by Kristiful: https://www.asianfanfics.com/story/view/553062/hardships-and-a-photobook-angst-drama-romance-exo-baekhyun

Feels huh. Most of the fics I've read these days are exo fics tho. These 2 are the ones that come to my mind right now if you want to read (mostly) sad fics:
Thunderbirds don't live forever http://www.asianfanfics.com/story/view/839231/thunderbirds-don-t-live-forever-angst-exo-chen-suho-suchen-mamaau-angst000exo
Aegis https://www.asianfanfics.com/story/view/651544/aegis-fantasy-romance-scifi-kaisoo-mamaau

@Jstarfully Thanks for the suggestion I will read all of them~

Okay so these are all idolxOC, not sure if they're sad, but these are in my exclusive favourites list, and I'm very picky. Most of them should stir up your emotions at least somewhat haha
+Attayear - a scifi timetravel!au with BaekhyunxOC http://www.asianfanfics.com/story/view/1057344/attayear-action-angst-fantasy-romance-schoollife-scifi-baekhyun
+King of my World - another timetravel!au with BaekxOC but it's kinda reverse timetravel mostly. less of a time-machine kinda thing. http://www.asianfanfics.com/story/view/537699/king-of-my-world-friendship-joseon-romcom-timetravel-historical-exo-baekhyun
+The Great Reclamation - dystopian!au where North Korea takes over South, idolxOC http://www.asianfanfics.com/story/view/1001359/the-great-reclamation-drama-romance-originalcharacter-bts
+Mind Games - Kind of a supernatural police kinda thing, but quite dark. The main character is quite complicated and has a difficult past, idolxOC http://www.asianfanfics.com/story/view/574388/mind-games-dbsk-fantasy-supernatural-exo-kai-sehun-bap
+Running With Wolves - Also supernatural, but more of a vigilante feel. Less dark, but still tons of action. KaixOC http://www.asianfanfics.com/story/view/662881/running-with-wolves-action-fluff-magic-werewolves-exo-kai
+Lured - This one is a bit hard to describe, but the premise is a nice girl changing everything about herself to be with the popular bad boy. Trust me, it isn't cliche at all though. SehunxOC http://www.asianfanfics.com/story/view/479807/lured-drama-romance-exo-sehun
+Shift - This is less extravagant than the others, but still a good story. Supernatural, but most of the creatures involved are werewolves. IdolxOC http://www.asianfanfics.com/story/view/970794/shift-jin-bts-bangtanboys-rapmonster-jungkook-suga

@Vividimole Thanks I will read all of them~ ^^

I have some recommendations:
Midnight Is For Regrets //This is a really sad fic and when I read it, I was borderline sobbing near the end.
http://www.asianfanfics.com/story/view/1017739/midnight-is-for-regrets-angst-romance-tragedy-shortfic-originalcharacter-exo-kai
Final Concerto //Another sad story
http://www.asianfanfics.com/story/view/643328/final-concerto-angst-romance-exo-baekhyun-timeslip
Love & War // Epic romance drama. This fic played with my emotions with every chapter.
http://www.asianfanfics.com/story/view/989133/love-war-drama-romance-war-exo-kai
Never Let Me Go //tragic ending
http://www.asianfanfics.com/story/view/1074714/never-let-me-go-angst-drama-romance-you-historical-exo-kyungsoo

I hope you like them :)