They have become a friends since they first met at the Elementary school untill now, 

In the HIGH SCHOOL. Yes, they're Hye Young and Luhan.

Everyone said they're looks like a couple, but two of them disagree about that.

But, after a few years being a friends one of them want to be 'more than a friend' relationship.

One of them was hiding his feeling.  One of them express his feeling with a picture that she/he draw. 

Who is it?  And can they keep their friendship relationship or not?