Psychiatrist Dr. Cheon is a fake exorcist who doesn't believe in ghosts. He uses his intuition, his assistant, his YouTube channel, various gadgets and remote-controlled explosives to perform bogus exorcisms across the country. When a new client approaches him to save her little sister from evil spirits, he accepts her case. Ready to perform his phony healing routine, he suddenly discovers he’s involved in a case more powerful than he’s ever experienced, a real one!