Sa Hyeon-woo is an employee of the ‘Healing Agency,’ where he exorcises the possessed by pummeling evil spirits with his bare fists for a fee. While carrying out a commission, he discovers a malevolent group that throws the world into chaos by artificially injecting people with evil spirits. Infuriated by their tyranny that destroys precious bonds, Sa Hyeon-woo begins a life-or-death struggle to pull this evil out by its roots.