Ji Sung and Yesul were in love. Yeseul introduces Ji-sung to her parents, but she encounters opposition to marriage because Ji-sung is poor. In a hurry, he has sex with his older sister whom he usually likes, and after a while they get married. Likewise, Yeseul married another man. Although they each lead their own lives, Ye Seul, who is pregnant with Ji Sung’s child before marriage, begins an inseparable relationship.