The Sound of Locks at Midnight

Living alone late at night, he hears the sound of a lock turning for no reason at his bolted bedroom door. Inside the empty house, an old key engraved with words appears out of nowhere. Strange events keep happening one after another. The silent old mansion hides a buried past, and the whereabouts of a missing tenant remain a mystery. His ordinary life alone suddenly plunges into a fog-shrouded abyss. Whispers linger by his ears, and shadowy figures follow him in the dark. Clues intertwine in layer upon layer of eerie mystery, and behind these seemingly unsolvable supernatural events lies a secret conspiracy years in the making. As the truth slowly comes to light, everyone around him has their own hidden agenda. With every step drawing him deeper into the trap, how can he escape this endless darkness?