Ku San Young works part-time during the day and studies during the night to become a low ranking public officer. After coming into possession of a relic from her dead father mysterious deaths take place around her, and she finds herself slowly changing. Yeom Hae Sang is a Korean folklore teacher at a university with the ability to see demons. As a child he saw his mother killed by a demon. When Hae-Sang meets San-Young he faces the demon which killed his mother.