The protagonist who transmigrated from a post-apocalyptic underground city into the body of a five-year-old slow-witted orphan girl with a slight intellectual disability. In her previous life, she lived in underground cities built over a hundred meters below the surface after Earth suffered a Cambrian Ice Age fifty years prior. She had never seen the sun, green trees, wildflowers, or fresh air. She is sharp-witted despite her foolish exterior, possesses a Marketplace System from the apocalypse, and can sell items from this world to the post-apocalyptic world at a 1000:1 exchange rate. She drools frequently and pretends to be foolish to blend in.
