Room No.7 (2017)

Tae-jung, the part-time worker of a DVD room, hides drugs in room #7 in exchange for wiping off his debt. When he goes back to the room to retrieve the drugs but realizes that the door is completely locked down by his employer, who also has secretly hidden a dead body inside. A dangerous battle of wits ensues between a man who must lock away the secret behind the door, and another, who must go inside.