Imagine being trapped in a nightmare, forced to relive a past life as a villain destined for a grim end. "Theatrical Regression Life" plunges into this very scenario, following a protagonist cursed with the memories of a previous existence – one as an immortal being unable to find peace in death. Now, reincarnated as a minor antagonist in a brutal R18 survival novel, he faces an even more daunting challenge. Our MC finds himself in a modern world where a select few are ripped from reality and thrown into the perilous "Underworld." This parallel dimension is a battleground where survival hinges on defeating grotesque monsters. He is forced to fight alongside other unwilling participants, including psychopaths and other cruel characters, but he must also confront his own dark past and apathetic nature. What makes "Theatrical Regression Life" truly captivating is its blend of dark fantasy, interdimensional travel, and a heavy dose of psychological drama. The story explores themes of brotherhood forged in the face of annihilation, fanaticism, and the blurred lines between enemies and allies. With an overpowered yet traumatized protagonist at its core, this novel promises a rollercoaster of emotions, unexpected alliances, and a desperate fight for survival against impossible odds. Will he break free from this theatrical regression, or will he succumb to the deadly script of his new reality?