First of all, wow! I wouldn't have thought that so many liked the profiles thingy! Thanks for all the comments, and I've fixed the Sehun pic. :3

I don't think I have to put as many gifs/pics of the side characters as I did with Sehun and Ara. Depending on my mood (lol) and what pics I find, I will give you pics of how they look like. But Kai and Hyejin will probably get many... XD Kai is self-explanatory and since Yoona portrays Hyejin and I just adore Yoona about as much as I adore Krystal, the other one is pretty clear as well, haha. 

I'm not going to make profiles for all the other EXO-K boys though because we all know EXO's birthday and it's the same except for the year of their birthday since I have to change their age to make them students, haha.

Hyejin:

normal, smiling face

laughing and "fangirling" 

cutely smiling

sad expression, crying

I chose Yoona to portray Hyejin not only because she and Krystal really look like sisters, but because that girl is freaking cute, and Hyejin basically oozes aegyo and cuteness. However, I am definitely aware of Yoona being more than 4 years older than Krystal, which is why I wish for you to imagine the young Yoona, around 2007-2009, to portray Hyejin and not the Yoona from now (she looks a tad too elegant and mature now to portray Hyejin).

Hyejin smiles, laughs and giggles a lot. However, she also cries a lot. She shows much more expressions than Sehun and Ara together. But most of the time, her smiles hold no big meaning - they're not faux, though - and she just laughes and smiles because she is a positive person