Dreampia Department Store is preparing to re-open after being closed due to a mysterious fire. However a series of murders is discovered: late at night, an employee in the planning department is found in the restroom with her throat slit; Section Chief KIM from the General Affairs department dies alone at night in the elevator with a pen thrust into his ear. The only commonality in the cases is their location in front of mirrors. WOO Young-min, a former policeman who inadvertently brought about the death of his partner and left the force and gets a security job at the store.
