Ku San Young juggles part-time work and studying to become a public officer. After receiving items from her deceased father, she becomes entangled in strange deaths and begins to change.

Yeom Hae Sang, a wealthy folklore professor with the ability to see demons, witnessed his mother's death at their hands. He meets Ku San Young and confronts the demon that killed his mother.

Lee Hong Sae, a career-focused police lieutenant, becomes embroiled in these mysterious events through his involvement with Ku San Young and Yeom Hae Sang.

(Source: MyDramaList)