2015, Seoul.

After getting involved in a hit-and-run accident, a girl named Young-shin suffers from various inexplicable phenomenons… Father Kim (KIM Yoon-seok) is a renegade priest who is shunned by the church for breaking rules and codes of conduct over the years. Despite everyone’s pleas, he decides to conduct one last exorcism on Young-shin and begins to make preparations.

For the exorcism to be carried out successfully, Father Kim requires an assistant, someone who is witty, and bold. Deacon Choi (GANG Dong-won) is chosen for the role, who is given a secret mission by the church to monitor Father Kim and report any wrongdoings. Once the preparation is complete, they walk into Young-shin’s bedroom. Fully knowing that they may not walk out of there alive, they begin the dangerous ritual…

“Do not look at her at any cost. From here on, you do not exist”