Jang Mi finally confronts her identical twin, Seo Rin, whose shocking indifference to their shared origins conceals a chilling secret. While Jang Mi desperately seeks answers about her parents' past, Seo Rin casually proposes a perilous life swap, seeing it as mere entertainment. Unaware of the dangerous game unfolding, Chae Hwa Young remains fixated on eliminating Jang Mi, a persistent threat to her carefully constructed world.