It is assigned that hyunwoo is a enemy to jiyeon but at last they are in love seunghoo and seoyeon wanted to breck them up.But they failed. Main Character: LEE HYUNWOO:jiyeon's enemy,but will be lover,iu's big brother,highschool student. PARK JIYEON:hyunwoo's enemy,but will be his lover,suzy's big sister,highschool student.