Synopsis：After her younger sister Seorin took her own life, Seoyoon became convinced that her husband Yeonsuk was responsible. Undergoing a full-body transformation, she assumes a new identity as Arin and draws close to him, intending to lure him into her carefully crafted revenge. But when Yeonsuk’s younger brother Jubin falls sincerely in love with Arin, Seoyoon’s plan starts to crumble. Will she carry out her revenge to the end, or will unexpected feelings change everything?