Tan Jinxiao pointed into the depths of the cave and said: "This is the Underground City, and up ahead is the Human Market."
Li Banfeng asked: "What kind of place is the Human Market?"
"A place that sells people."
"What other places are there besides the Human Market?"
"There's also the Earth Market, a place that sells earth."
"Besides the Earth Market?"
"There's also the Sea City, a place that sells fish."
Li Banfeng frowned: "In the Underground City, is there really a sea?"
"Yes!" Tan Jinxiao nodded earnestly, "A very large sea."
Juanzi nodded beside him: "The rumors I heard as a child said the same, that in the Underground City there's a sea with endless fish and shrimp, where no one goes hungry."
Tan Jinxiao shook his head: "Still, people can go hungry."
Li Banfeng was very interested in this Underground City: "Besides the Sea City, are there other places?"
"Yes, but the other place is unreachable; it's the Sky Market."
"What kind of place is the Sky Market?"
