So, I'm thinking about writing a new fanfic but I can't decide the main characters of my story. BTS or EXO?

The genre is Romance/Thriller. I know, it's strange.

The personality of the main character is cold, intelligent and quiet. Please help me decide by voting, on the next poll. 

If EXO is chosen, the second characters will be Sehun and Kai.

If BTS is chosen, Jin and V.

Thanks!