As the eldest daughter, Ja-young shoulders the responsibility of caring for her younger siblings as well as her ailing mother. She had been engaged to marry Sang-min, but shortly before the wedding Sang-min abruptly rejects her so that he can marry Min-joo, who is his boss as well as a wealthy young heiress. From there, things only get worse for Ja-young--a lot worse. Meanwhile, Ja-young's younger brother (Tae-young) develops a friendship with Sun-joo (Min-joo' younger sister). When he discovers that the fiance of Sun-joo's sister is his sister's ex-fiance, he plots revenge on the man who jilted his older sister, while Sun-joo (who resents her ambitious older sister