A coincidence that isn't a coincidence????

A story about the female protagonist meeting Park Ji-hoon (the male protagonist) as if it were a coincidence???? The female protagonist and Park Ji-hoon (the male protagonist) like each other but don't realize each other's feelings???? The two have been friends since elementary school, 12 years???? But then, a new male protagonist named Bae Jin-young appears...???? Where will this story end????