Scary Hair (2005)

In Seoul, Su-Hyeon is terminal with leukemia, and bald due the treatment of chemotherapy. Her sister Ji-Hyeon buys a long-haired wig, but she does not disclose the truth about Su-Hyeon's health condition to her beloved sister. While wearing the wig, Su-Hyeon recovers her health and hits Ji-Hyeon's former boyfriend Ki-Seok, changing her behavior and relationship with her sister. When Ji-Hyeon discovers that the wig is possessed by a fiend, she finds that it was manufactured using hair of a cadaver and a dark secret about Ki-Seok's sentimental life.