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 ...
Yoo Sul-young
Jo Wan-jin
Oh Ji-hyun
Do Mo-se
Jo Yong-bok
Sang Woo
Lee Yeon-kyung