I picked EXO, because I'm more into them? Like, I think my thoughts about how the real members are are quiet likely to be truth, so um, TaoHun seems the best option.
But, going just behind them is Super Junior. Because that subject is mature and so are they.

I think EXO SeHun, Tao and Kris would fit the best :) And even if it's hard for me to read this kind of story, I read it anyway because the story is powerful and also because I respect the author's hard work.

I think Suju is the best option cos they suffered a lot of things.. e.g. Kyuhyun nearly died cos of the accident..

suju! suju! suju! I want suju but why it so little...
SUJU THE BEST *thump up* Believe me!! ^^

Suju would be the best option seeing as they had suffered the most out of the two groups you've mentioned.

I'd read anyone but EXO these days... You could write about two cats and I'd read it. I swear.

Sorry you're depressed :(

I think that if you did an EXO member, it would be easier to start with. Since they are used for the more anguish-y things anyways, but so is BAP. I don't really like reading ones from SuJu cause there usually not any good at visual detail. But I think that Exo would be a good starting point cause of how you can twist them around much more easily. Just my thoughts....

Kinda random vote for me but it's an interesting concept and sometimes writing dark stuff can really help you get through things. *hugs*