My crude friend

Kim Namjoon - a handsome, insanely smart fellow, who also seems decent at first sight. Any girl would become infatuated with at first sight.
There was just one slight problem.
He is a P.E.R.V.E.R.T.
Making crude jokes and remarks about any females, that come into sight, is his favorite pastime. Another enjoyment in his life consists of watching girls' wardrobe malfunctions, even snapping a few pictures as memorabilia.
But, besides all that, he's a pretty decent guy, if you can tolerate all his crudeness, that is. However, all the girls at school, have learnt to distance themselves away from him, turning their pretty little noses in disgust when they catch him eyeing some poor, helpless prey. Thinking about it, he actually hasn't been spoken to, by a girl since middle school. All of them avoid him, except for her...

She was the only girl, he didn't perv on. Don't misunderstand, she's not horrendously ugly, in fact she was far from it, even if Namjoon wouldn't admit it, she was probably the most picturesque he ever laid eyes on. The only reason, he stopped himself from looking at her dirtily, was because she was his best friend of a good, eventful 10 years. And probably the only female who could and would stick by his side, and manage his repulsing nature.
You could say after all these years, while she had been questioning herself, on why they were friends, she had become immune to his lewd remarks and humor, even finding herself shamelessly, amused by some. Her name is, Kim Chungha, and this is the story of her and her best friend the pervert.

"Oi, don't badmouth him! That pervert is my best friend!
Yea... i don't really get it either."