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 ...

Cast

Do Mo-se

Jo Wan-jin

Jo Yong-bok

Lee Yeon-kyung

Oh Ji-hyun

Sang Woo

Yoo Sul-young