3 collage students (Thalia, Erlan and Ahmad) majoring in psychology study a mentally ill patient for their thesis material because the patient's illness was considered strange. Nina is 19 and she has suffered from mental illness for 3 years, she once declared cured but relapses again and so on.

Who breaks the rule shall take responsibility for it. There is a superstition in Korea that no one should visit a wake when there’s a baby under three weeks among the family members; but Woo-jin doesn’t believe it. He receives a text message that his ex-girlfriend passed away, and despite his wife’s dissuasion, he goes to the wake and mourns for her. After that day, strange things start to happen, and his baby becomes sick without reason. His wife now demands him to transfer this misfortune to other people by stealing a few things- two things from any store, one thing from a stranger.

Investigating reports of demonic possessions in a remote village, a skeptical military officer finds his beliefs tested by an enigmatic exorcist