Starring Don Lee as Bau, the leader of a secret team known as Holy Night, that hunts down demon-worshipping cults threatening Seoul. Alongside Sharon (Seohyun), who can detect and exorcise demons, and Kim-kun (David Lee), their tactical support, the team faces a rising evil. When psychiatrist Jung-Won (Kyung Soo-Jin) seeks their help to save her younger sister Eun-Seo (Jung Ji-So) from demonic possession, the mission becomes more dangerous than ever.
