성훈 × 니키 Park Sunghoon, a shy and quiet introvert who's best friend is a loud and friendly extrovert. He falls for him but is too shy to confess, so he starts leaving letters in the younger's locker, what happens then?

Enemy that fall in love with each other after didn't talk for a few months because of a big fight. One day their friends has a plan to make them stop hating each other and talk with each other again. Will their friends plan worked out? Or it will be messed up? Or the plan work but something that unexpected happends?