sweet, another addition to MC Highschool Series!!!
even though I can't read Korean, I think this fifth volume is about the bullied girl's (Yuuko? I can't remember her name) past, and about how she is the only other sane person besides Yui, but decide to embrace the insanity around the school
anyway, it's pretty rare for Mizuryu Kei to wrote series like this, so I'm pretty sure this one'll be compiled into one tank soon. Maybe at C85 or C86?
-edit- I see that there's a raw version uploaded, and also somehow there's MC Gakuen Tank (is it? or maybe it's just a self-made compilation by a member?) already uploaded, although I believe that this series hasn't ended yet....