The secret story of the sexiest and youthful sisters that can not be revealed! The confidential secret of the boyfriends who reveal is revealed. He is a sister. Sukyoung is between Sangwoo and Jinhee and loving each other. The two of them talk about their lover, and when they accidentally find out that their boyfriends are high school alumni, they ask about her sister's boyfriend ... 한국 작품이 아닌 외국 작품은 오뜨랑에서 번역 버튼을 통해 실시간 한글로 번역해서 한글 줄거리도 볼 수 있습니다.