This is a world where the sky is round and the earth is square. It appears boundless, but is actually finite. The land is a square, and people work on it, rising with the sun and returning home at sunset. Yet there is a mysterious place on this land called the Bronze Gate. The gate is enormous. Whenever it opens, monsters come to snatch people, and anyone they set their sights on has no chance of escape. The Bronze Gate only opens once after a very long time. 4 S90 is the protagonist’s name, or rather, he has no name here, only a number. Later, Xiao Jiu escapes from the Bronze Gate and discovers that the outside world belongs to the rich. Everyone who was taken away had been providing organs and limbs for these wealthy people. Furious, Xiao Jiu obtains evidence, returns inside the Bronze Gate, and tells everyone the truth. The people unite to fight back, and eventually overthrow the rich people’s system of keeping them in captivity.
