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This Huangquan pawnshop is opened in the gap between yin and yang. It is hidden in the market during the day and connects yin and yang in the middle of the night. Everything can be pawned: a person's lifespan, marriage, luck, and memory; The demon's cultivation, demon soul, and Taoism; The cause and effect, karma, reincarnation, and obsession of the Yins. When a thing is paid for a debt, it can be exchanged for a lifetime. All transactions are non-returnable and you are responsible for the consequences. The protagonist is the sole owner of Huangquan Pawn Shop, sitting in Yin and Yang, witnessing all kinds of situations in the world, the greed of ghosts and gods, and the obsession of demons.