Moon Byul's average life was gone out of the window when her most hated childhood friend, Moon Taeil moves back from America that summer. They never like each other and you could find them always arguing because they are too similar, even their parents try to match the two once. Byul could only pray that Taeil will not bugging her life as hard as he used to be, because she had enough of it and she doesn't want Taeil to embarrass her infront her crush, Jung Jaehyun. Like a bug who bites in the summer, Moon Taeil is back to haunt Byul's life again. Will he bites to make matters gone wrong on Byul's life or the bites has different effect?