Having lost her voice in an accident, Ji-hyun devotedly nurses her younger sister, Su-hyun, whose remaining time is finite. Then one day, the lives of these loving sisters change dramatically. As a present to fill the emptiness left behind by the chemotherapy, Ji-hyun buys Su-hyun a wig. From that day on, Su-hyun gradually regains her vivacious spirit. However, the traces of a tragic death and the deceased's memories remain with the wig. It starts to change Su-hyun into an entirely different person and Ji-hyun watches over her with worry.