Woo Yeong-min, a former police officer, left the force following a tragic incident where his attempt to rescue his partner inadvertently led to his partner’s death. Now employed as a security guard at a shopping mall owned by his uncle, which is set to reopen soon, he finds himself entangled in a string of unexplained deaths occurring there. As he confronts his phobia of mirrors, he must also unravel the enigma of the fire that originally shut down the mall.