A dedicated workaholic, always immersed in his tasks and with little time for others, unexpectedly finds himself trapped inside his office. After finishing his work late one evening, he hurriedly attempts to leave but quickly realizes the front door is nowhere to be found. His phone suddenly ceases to function, and eventually, it vanishes entirely. To make matters worse, none of the other phones in the office respond or work. As hours pass, he begins to hear strange noises and sensations, gradually realizing he is not alone in this confined space—an environment from which there appears to be no way out.