A skilled young female agent is tasked with capturing a rogue former agent before she can unleash a biological weapon starting with the wealthy and powerful purveyors of the international sex trade.
Kang Eun-kyung, who has come for her teaching practicum, encounters members of the Black Sky black magic club, who are ranked first in the national mock exams. She discovers that there is a witch behind the girls. To retrieve the souls that the witch has
