What is the most terrifying thing in the world? Is it the quiet long night or the endless panic that is isolated and helpless? What is your answer? Feng Heng, who was in a coma, murmurs faintly sounded in his ears. He opened his misty eyes, raised his eyes and looked in the sound. There was only a faint white mist extending infinitely to the horizon in front of him. Walking forward, the illusion hidden in the mist gradually revealed. The building that was worn out by endless darkness was wet and ulcerated by the drizzle of rain; the ghost that was pale and then dark suddenly became clear and then blurred; the decayed and decayed like bones Trees, wastelands that wither like nightmares; ancient altars with blood flowing into rivers, bloody mountain mists with corpses everywhere; ghost houses, swamps, museums; cities, islands, and lakes of dead people. Feng Heng, who gradually fades away, looks forward in a fascinating way. There is only one, himself. The most terrifying thing is probably the human heart. [Keywords Verification of human nature is successful, 'Dark World' is officially opened] Human hearts are not old, this is the truth of this world. The hearts of the world are all corrupt. (Concentrated reasoning, escape, escape room, cards, survival and other elements)