In a world on the decline, Do-Hyun's mundane existence is abruptly disrupted when he awakens in a gym warehouse, bound and at the mercy of his enigmatic captor Sung-Ho. Trapped in a nightmarish game of memories from their high school days, Do-Hyun grapples with uncovering the identity of his tormentor. As Sung-Ho cruelly reenacts past traumas in the same location, Do-Hyun struggles to outmaneuver him, unwittingly unleashing a dark, controlling force within Sung-Ho. With each revelation, Do-Hyun unravels a tale of recklessness and consequences that goes far beyond their shared history.