A mystery thriller about what happens when a detective finds out that a case he is working on resembles a novel while investigating the death of a best-selling author's husband.
A young boy Hee-Joon is possessed by an evil spirit. Nun Yunia tries to save him, assisted by Nun Mikaela. Priest Paul attempts medical treatment, while Priest Andrew performs an exorcism to rid Hee-Joon of the spirit.